isomp4: Rename GstQTMux to GstBaseQTMux to avoid breaking API
Since 52b63de1 the qtmux GType was renamed GstQTMuxElement which breaks presets, revert that change.
Edited by Thibault Saunier
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Since 52b63de1 the qtmux GType was renamed GstQTMuxElement which breaks presets, revert that change.