This reverts commit 4608e1e1.

The ASF Reader filter suffers from defects which are difficult to solve,
and will require a better implementation of wmvcore in order to work
correctly. In the meantime, revert the class registration so that the
File Source filter is preferred instead.

This will break games that tried to use the filter directly and which
may have started to work correctly, but they are less frequent than the
ones simply playing wmv videos with quartz.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53640
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53748
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54191