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filter-utils.lua: Check media type when finding the default filter

Julian Bouzas requested to merge julian/wireplumber:fix-smart-filters-for-video into master

This MR fixes the get_filter_from_target() API from filter-utils.lua so that it does not return an audio filter for video targets. This avoids WirePlumber trying to link a video stream node with the default audio smart filter if smart audio filters are configured.

The fix adds a media_type param in the get_filter_from_target() API to make sure the desired type of filter is returned. The rest of APIs don't need such media_type param because they already have the link_group param, which is unique for all filters (both audio and video).

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