Moes TRV: mark both instances of dps 108 and 109 as optional

In main climate entity they were marked optional, but in the entities
for setting them, that was forgotten.

Issue #1780

custom_components/tuya_local/devices/moes_trv_thermostat.yaml

@@ -182,6 +182,7 @@ secondary_entities:
     dps:
       - id: 108
         type: integer
+        optional: true
         name: value
         unit: C
         range:
@@ -194,6 +195,7 @@ secondary_entities:
     dps:
       - id: 109
         type: integer
+        optional: true
         name: value
         unit: C
         range: