Add missing Shelly Cover sensors bugfix (#71831)

Switching Shelly Plus 2PM from switch to cover mode results in missing sensors for Power, Voltage, Energy and Temperature.

These parameters are still available in the API, but need to be accessed via "cover" key instead of "switch" key.

This change adds the missing sensors.

homeassistant/components/shelly/utils.py

@@ -297,6 +297,9 @@ def get_rpc_key_instances(keys_dict: dict[str, Any], key: str) -> list[str]:
     if key in keys_dict:
         return [key]
 
+    if key == "switch" and "cover:0" in keys_dict:
+        key = "cover"
+
     keys_list: list[str] = []
     for i in range(MAX_RPC_KEY_INSTANCES):
         key_inst = f"{key}:{i}"