Dispose Track::refreshCoverImageDigest() reading covers from the main thread #4904
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This fixes https://bugs.launchpad.net/mixxx/+bug/1905124
After a cover is read by the CoverArtDelegate via a worker thread, it tries to update the Cover Image Digest via a Track object. During creation of this Track object, the cover is read again this time from the main thread, creating the scrolling issue.
When the cover is read by widgets via an existing Track object, the CoverArtCache will update the Track object in the worker thread. There is also no need for a cover lookup in the main thread when creating the Track.