MT15/29 airbox: add product details for MT29 and rename file

Seems to be sold under several brands, but Mustool matches the "MT"
model prefix, so most likely as the original manufacturer.

File renamed to match convention.

PR #3054

custom_components/tuya_local/devices/mt15_mt29_airbox.yaml → custom_components/tuya_local/devices/mustool_mt15mt29_airbox.yaml

@@ -1,7 +1,8 @@
 name: AirBox
-# products:
-#   - id: bf2cd2e61dc121e657jsbj
-#     model: MT15/MT29
+products:
+  - id: owmkja70doamcxkh
+    manufacturer: Mustool
+    model: MT29
 entities:
   - entity: sensor
     translation_key: air_quality