Recording scrubbing fixes

[hawkeye217]

There was a race condition in the initialization of a new DynamicVideoController where scrubbing inside the controller would be initially false just for a split second even though the user had not released the handlebar on the timeline from scrubbing. This PR uses the isScrubbing that gets passed back from the handlebar as a single source of truth for scrubbing.

Also, scrubbing between hours without releasing the handlebar will still cause onPlayerLoaded to be called to load a new hour. Autoplay would kick in and would start playing the new hour in the background sometimes just for a second and onTimeUpdate would be called, setting a new seeking timestamp, even though the handlebar had never been released and seeking was still true. Because seekToTimestamp automatically sets the player mode to "playback", the video player would get sometimes get confused as to what the user actually wanted to seek to when releasing the handlebar. As a result, the handlebar would sometimes jump to near the beginning of the hour, even if released at a time much later in the hour.

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