Miscellaneous Fixes (#21241)

* only show jwt secret tip for admin users

* fix preview endpoint 403 for viewer role when "all" param is used

* Update docs dependencies

* add warning if ffmpeg isn't selected for reolink http streams

* Update the motion for motion masks

* Also update objects

* Add docs about backchannel and two way talk takeover

* don't require restart when deleting zone or mask

* Ensure motion is correctly set when adjusting masks

* don't use python style raw prefixes in yaml examples in LPR docs

* wording

---------

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

frigate/motion/improved_motion.py

@@ -239,6 +239,12 @@ class ImprovedMotionDetector(MotionDetector):
         )
         self.mask = np.where(resized_mask == [0])
 
+        # Reset motion detection state when mask changes
+        # so motion detection can quickly recalibrate with the new mask
+        self.avg_frame = np.zeros(self.motion_frame_size, np.float32)
+        self.calibrating = True
+        self.motion_frame_count = 0
+
     def stop(self) -> None:
         """stop the motion detector."""
         pass