Dongguan garage door opener: change garage to gate.

In evaluating PR #2984, only the class seems to differ significantly.
The PR uses open rather than action, which seems better since the action
is only mapped to opened and closed anyway, and looking at the comments
the original dongguan device seems to also be a gate opener, so class
also updated.

custom_components/tuya_local/devices/dongguan_garage_door_opener.yaml

@@ -2,14 +2,15 @@
 # Tuya Smart Life WiFi Motorized Swing Gate Sliding Gate Opener Dry Contact
 # 110V 240V Voice Control with Alexa Google Home
 # https://www.aliexpress.com/item/1005003913566298.html
-name: Garage opener
+name: Gate opener
 products:
   - id: 1wwbzczt9hrtwqjr
     manufacturer: Dongguan Pinjia
     model: PJ-WGDOOR01
+  - id: deyeioifmyvdalnc
 entities:
   - entity: cover
-    class: garage
+    class: gate
     dps:
       - id: 1
         type: boolean
@@ -22,12 +23,7 @@ entities:
             value: close
       - id: 3
         type: boolean
-        name: action
-        mapping:
-          - dps_val: true
-            value: opened
-          - dps_val: false
-            value: closed
+        name: open
   - entity: number
     translation_key: timer
     class: duration