Add % unit to Schneider TRV "display brightness" (#3739)

Author: TheJulianJES

zhaquirks/schneiderelectric/thermostat.py

@@ -5,6 +5,7 @@
 from zigpy.quirks import CustomCluster
 from zigpy.quirks.v2 import EntityType, QuirkBuilder
 from zigpy.quirks.v2.homeassistant import (
+    PERCENTAGE,
     EntityPlatform,
     UnitOfPower,
     UnitOfTemperature,
@@ -597,7 +598,7 @@ class AttributeDefs(CustomCluster.AttributeDefs):
         attribute_name=SEUserInterface.AttributeDefs.se_brightness.name,
         translation_key="display_brightness",
         fallback_name="Display brightness",
-        # unit="%",
+        unit=PERCENTAGE,
         min_value=0,
         max_value=100,
         step=1,
@@ -608,7 +609,7 @@ class AttributeDefs(CustomCluster.AttributeDefs):
         attribute_name=SEUserInterface.AttributeDefs.se_inactive_brightness.name,
         translation_key="display_inactive_brightness",
         fallback_name="Display inactive brightness",
-        # unit="%",
+        unit=PERCENTAGE,
         min_value=0,
         max_value=100,
         step=1,