qtmux: Don't need to update track per GstCaps if it's not changed
Skip GstQTMuxPad::set_caps() call for duplicated caps. All the processing done in set_caps() method for duplicated caps are redundant.
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Skip GstQTMuxPad::set_caps() call for duplicated caps. All the processing done in set_caps() method for duplicated caps are redundant.