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playbin2/3: autoplug/caps: don't expand caps to ANY

Matthew Waters requested to merge ystreet/gstreamer:base-playbin-autoplug-query-avoid-any into main

Retrieving the pad template caps from a ghost pad returns ANY which when merged with any other caps will return ANY. ANY is not very specific and may cause suboptimal code paths in e.g. decoders that assume the lowest common denominator when presented with ANY caps.

Fixes negotiating dma-buf with vaapidecodebin between glupload in the video sink element.

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