(BUG) {Devices not saving in Homebridge V2 Smartthings Classic app} 
## 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!**

-  [ ] That _OAuth_ is Enabled for the SmartApp under the IDE.
-  [ ] The SmartApp and Device Handler are using the latest code available.
-  [ ] 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?: 1
-  Mobile App Version(Not required): Latest version, installed from iOS appstore today
-  SmartApp Version: v2.3.3
-  Device Handler Version: v2.3.4 (I think? It's the version of the plugin in Homebridge on my Rasp Pi)
-  Homebridge Version: 1.1.1
-  NodeJS Version: v12.18.2 

## Expected Behavior
**Tell us what you think should be happening**
When I add my Samsung AKG VL5 speaker in the Homebridge V2 app in SmartThings Classic, press Done and Save it should save the device.

## Current Behavior
**What happens instead of the expected behavior?**
When I reopen the Homebridge V2 app in STC it didn't save the speaker and I can reselect it but the same thing happens over and over again.

## 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. Open Homebridge V2 in SmartThings Classic
2. Press Define Device Types (or Select your Devices, tried both)
3. Select Speakers
4. Check "[AV] Samsung AKG VL5"
5. Press Done
6. Press Done again
7. Press Save
8. Get green message bar saying "Homebridge v2 is now installed and automating"
9. Relaunch the app and the device is not saved.

## Context
**How has this issue affected you? What are you trying to accomplish?
I can't add my speaker, is a SmartThings Hub required for this step? I don't have one. I also have to buy an AppleTV to add the Homebridge to, but I thought I would get this running before committing to that.

**Providing context helps us come up with a solution that is most useful in the real world**

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


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