tests: fix test_play_media_info failure and re-enable player tests
Submitted by Edward Hervey
Created attachment 359283
GST_DEBUG Log of failure
libs/player.c:753:F:general:test_play_media_info:0: 'GPOINTER_TO_INT (state.test_data)' (2) is not equal to '1' (1)
The "problem" is that more than one media info update gets emitted (because some information gets updated after a while, like bitrates).
Attachment 359283, "GST_DEBUG Log of failure":
Depends on: #394.