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avdec_h265: Fix endless renegotiation with alternate interlacing

Nicolas Dufresne requested to merge ndufresne/gstreamer:avdec-alternate-interlace-fix into main

The picture parameter picture->top_field_first is reused in this mode to signal the TOP fields. As a side effect, it will change every frame and current code assumed that if this changes then a renegotiation is needed. Fixed this by ignoring that change whenever we are decoding one field only.

cc @bilboed

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