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gltestsrc: Run context query only during decide_allocation

Philippe Normand requested to merge philn/gst-plugins-base:philn/gltestsrc-context into master

Running the context query in _start and during the NULL->READY state transition can fail because downstream elements might not be able to answer and thus the source element would not be able to reuse downstream GLContext and GLDisplay.

This issue happened specifically when trying to use gltestsrc in playbin.

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