(BUG) Z-Wave Fan uses wrong fan speed value
## Verify the following before opening an trouble issue

**Go over all the following points, and put an `x` in all the boxes that apply.
If you're unsure about any of these, don't hesitate to ask. We're here to help!**

-  [x] That _OAuth_ is Enabled for the SmartApp under the IDE.
-  [x] The SmartApp and Device Handler are using the latest code available.
-  [x] That Both the SmartApps and Device Handlers have been _Published for You_ in the IDE.

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## About Your Setup
-  How many devices are detected?: 12
-  Mobile App Version(Not required): idk. Latest on iOS.
-  SmartApp Version: v2.3.3
-  Device Handler Version: I don't know. It's a default device handler.
-  Homebridge Version: v1.1.7
-  NodeJS Version: v12.16.3

## Expected Behavior
**Tell us what you think should be happening**

If I ask siri to turn the fan off (0%), it should set the Z-wave device's "switch" to off and "Fan Speed" parameter to 0, and "Level" parameter to 0.
If I ask siri to set fan speed to "low", it should set the Z-wave device's "switch" to on and "Fan Speed" parameter to 1, and/or "Level" parameter to 32.
If I ask siri to set fan speed to "medium", it should set the Z-wave device's "switch" to on and "Fan Speed" parameter to 2 and/or "Level" parameter to 66.
If I ask siri to set fan speed to "high", it should set the Z-wave device's "switch" to on and "Fan Speed" parameter to 3 and/or "Level" parameter to 100.

## Current Behavior
**What happens instead of the expected behavior?**

If I ask siri to set fan speed to "low", it sets the Z-wave device's "switch" to on "Level" parameter to 33 - this results in the fan speed being set to 2 (medium). This results in the home app showing the 33% level that I requested, but in SmartThings app, it shows "Medium". If I change it to "Low" in SmartThings app, it then reflects as the fan being ON at 0% in the home app, which should not be possible. SmartThings IDE then shows the "Level" at 32% and "Fan Speed" at "1".

It seems like iOS considers exactly 33% to be "low", but Smartthings (or this device) consider 32% to be "low" and anything higher (even 33%) to be "medium". Might be better to set the fan speed (0-3) instead of the "level".

## Steps to Reproduce (for bugs)
**Provide a link to a live example, or an unambiguous set of steps to reproduce this bug. Include code to reproduce, if relevant**

1. Add a Z-wave device with handler "Z-Wave Fan Controller" to SmartThings.
2. In the Homebridge v2 SmartApp, select the device as a "Fans (3 Speeds)" device.
3. Use the home app or siri to set the fan to 33% speed or "low".

## Context
**How has this issue affected you? What are you trying to accomplish?
**Providing context helps us come up with a solution that is most useful in the real world**

I have an automation to set the fan to "low", and it always ends up being on "medium" after I run the automation. I have to go into the smartthings app and manually decrease it to "low".

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Please include a copy of any relevant log output to assist in tracking down the bug

INFO: [Device Event]: (Guest Room Fan) [SWITCH] is off
INFO: [Device Event]: (Guest Room Fan) [LEVEL] is 0
INFO: [Device Event]: (Guest Room Fan) [FANSPEED] is 0
NOTICE: Sending Device Command: on | Name: (Guest Room Fan) | DeviceID: (69913479-6d89-4c63-ae8d-00551f2a85fa) | SendToLocalHub: (false)
DEBUG: sendDeviceCommand | Response: ""
NOTICE: Sending Device Command: setLevel | Value: {"value1":33} | Name: (Guest Room Fan) | DeviceID: (69913479-6d89-4c63-ae8d-00551f2a85fa) | SendToLocalHub: (false)
DEBUG: sendDeviceCommand | Response: ""
INFO: [Device Event]: (Guest Room Fan) [LEVEL] is 33
INFO: [Device Event]: (Guest Room Fan) [SWITCH] is on
INFO: [Device Event]: (Guest Room Fan) [FANSPEED] is 2

--- Home app shows fan is on "low" but it's spinning at medium speed. ---
--- Smartthings app shows the fan is on "medium" ---
--- I change the speed from "medium" to "low" in Smartthings App ---

INFO: [Device Event]: (Guest Room Fan) [FANSPEED] is 1
INFO: [Device Event]: (Guest Room Fan) [LEVEL] is 32

