PC311ty: HA does not support kVar, only var for reactive_power

The config was scaling by 1000 to get kVar.  It is better anyway to use
original the unscaled value in var.

custom_components/tuya_local/devices/pc311ty_energy_meter.yaml

@@ -139,9 +139,7 @@ secondary_entities:
       - id: 115
         name: sensor
         type: integer
-        unit: kVar
-        mapping:
-          - scale: 1000
+        unit: var
   - entity: sensor
     category: diagnostic
     name: Energy B
@@ -209,6 +207,4 @@ secondary_entities:
       - id: 116
         name: sensor
         type: integer
-        unit: kVar
-        mapping:
-          - scale: 1000
+        unit: var