Revert "Add a comment on fix"

This reverts commit 79a667a919d863bfb25c7382630a098919aaedfe.
Revert "Hope fix a gstreamer bug: https://code.google.com/p/quodlibet/source/diff?spec=svn1dcd91afd25144400f7f0172bc467ca87d9a1cd9&name=1dcd91afd251&r=1dcd91afd25144400f7f0172bc467ca87d9a1cd9&format=side&path=/quodlibet/quodlibet/player/gstbe.py"

This reverts commit 6ab8dc88090b1762c02fca7cb2f01ab8d151bf4f.
Fix track next for playlist mode