Homekit scenes do not set colors properly
**Describe the bug**
I have a fixture with 4 Tuya bulbs. I create two scenes in Homekit: "Blue" which should set all bulbs to blue, and "white" which should set all bulbs to white. When either scene is run, the bulbs end up in what appears to be random states: some blue, some white, some very dim, some very bright...

**Expected behavior**
When a scene sets a bulb color, the belt should set to that color. If a single scene sets multiple bulbs to a color, all the bulbs should be that color.

**Screenshots**
If applicable, add screenshots to help explain your problem.


**Device info (please complete the following information, which can be found in [log](https://github.com/tuya/tuya-homebridge/wiki/How-To-Get-Logs)):**
path = /v1.0/devices/eb8c6231e6461f4035o89w/commands

TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828414} path = /v1.0/devices/ebd84c3a5aa4577f3disak/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828419} path = /v1.0/devices/eb8c6231e6461f4035o89w/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828424} path = /v1.0/devices/ebd84c3a5aa4577f3disak/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828425} path = /v1.0/devices/ebb7e807177d239e840dgv/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828431} path = /v1.0/devices/ebb4d539f899f1d5d6qw1r/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828431} path = /v1.0/devices/eb8c6231e6461f4035o89w/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828457} path = /v1.0/devices/ebb7e807177d239e840dgv/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828540} path = /v1.0/devices/ebd84c3a5aa4577f3disak/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828539} path = /v1.0/devices/ebb4d539f899f1d5d6qw1r/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828546} path = /v1.0/devices/ebb4d539f899f1d5d6qw1r/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828571} path = /v1.0/devices/eb8c6231e6461f4035o89w/commands
TuyaOpenAPI response: {"result":true,"success":true,"t":1634161828571} path = /v1.0/devices/ebb7e807177d239e840dgv/commands

