chore: Add selector to set_schedule action (#43)

This allows editing the YAML value in the UI mode for the action, rather
than just in YAML mode.

Author: Mrtenz

custom_components/free_sleep/services.yaml

@@ -66,3 +66,5 @@ set_schedule:
           duration: 1
           enabled: false
           alarmTemperature: 82
+      selector:
+        object: {}