Fixes (#18262)

* Don't use timezone in export dialog timestamps

Revert an unnecessary change made in https://github.com/blakeblackshear/frigate/pull/18257

* Ensure notifications register button is only disabled when both all cameras and every individual camera is disabled

* Send test notification if any cameras are enabled

* clarify docs about disabling cameras

* fix crash in autotracking zoom

* clean up

* masks and zones i18n fixes

* Check if camera is enabled in config

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Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

frigate/ptz/autotrack.py

@@ -1109,6 +1109,7 @@ class PtzAutoTracker:
         camera_height = camera_config.frame_shape[0]
         camera_fps = camera_config.detect.fps
         predicted_movement_time = 0
+        zoom_distance = 0
 
         average_velocity = np.zeros((4,))
         predicted_box = obj.obj_data["box"]