msdkdec: do not try to set config on pool that is already active
For d3dvideosink in certain scenarios, we try to set config on msdk side buffer pool that is already active,
which returns an error. Instead, skip the config on the active pool.
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For d3dvideosink in certain scenarios, we try to set config on msdk side buffer pool that is already active,
which returns an error. Instead, skip the config on the active pool.