Zemismart: roller shade: add opened and closed to action

Based on other configs, the action only indicated opening or closing and
continues to indicate those even when the cover has fully opened or closed.
Use position to detect when it is fully opened or closed and report that.

#672

custom_components/tuya_local/devices/zemismart_roller_shade.yaml

@@ -35,6 +35,19 @@ primary_entity:
     - id: 7
       name: unreliable_action
       type: string
+      mapping:
+        - dps_val: opening
+          constraint: current_position
+          conditions:
+            - dps_val: 0
+              value: opened
+            - value: opening
+        - dps_val: closing
+          constraint: current_position
+          conditions:
+            - dps_val: 100
+              value: closed
+            - value: closing
     - id: 12
       name: fault_code
       type: bitfield