Disabled cameras fixing (#17273)

* Fix case where objects are returned as null

* Fix enabled status not being persisted

* Use config as source of truth when refreshed

* Ensure camera always have config object updated

* Cleanup typing

frigate/camera/state.py

@@ -306,7 +306,6 @@ class CameraState:
         # TODO: can i switch to looking this up and only changing when an event ends?
         # maintain best objects
         camera_activity: dict[str, list[any]] = {
-            "enabled": True,
             "motion": len(motion_boxes) > 0,
             "objects": [],
         }