gstinfo: fix debug levels being applied in the wrong order
Remove unneeded reapplication of patterns. Besides being superfluous (gst_debug_reset_threshold already applies patterns) it was also wrong and didn't stop checking patterns after the first match (broken in 67e9d139). Also fix up unit test which checked for the wrong order. https://bugzilla.gnome.org/show_bug.cgi?id=794717