Revert "tracker: Add hard dep for libmediaart"

This change should be done in the current development modulesets (3.12),
not in the stable 3.10 (that tracks tracker 0.16)

This reverts commit f89dd5da931de1316ab73657870ee6eb4a572093.
core-deps-3.12: Add libmediaart module
core-deps-3.12: tracker depends on libmediaart
core-deps-3.12: Update tracker dependencies