Fix for #3526992: Media revision shows `Anonymous` instead of correct user in DropzoneJS EB widget

Vinay Gawaderequested to merge
issue/dropzonejs-3526992:3526992-media-revision-shows into 8.x-2.x

Closes #3526992

This MR fixes the issue where media entities uploaded via the Media Entity DropzoneJS with edit & Media Entity DropzoneJS widget were incorrectly showing the revision author as Anonymous (not verified). It now correctly assigns revision_user to the current authenticated user.

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