fix latched loading spinner after cancelling a timeline selection (#24162)

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isLoading and isBuffering only clear on playback progress, and scrubbing holds the player paused, so a source rebuild during a timeline selection left them set with nothing able to clear them. Cancelling made them visible as a spinner over an already-loaded frame, which stayed until the next manual seek. Leaving a scrub now clears them when the source is loaded and the element holds a frame.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f