Modified pattern for detecting mdf in mds.

The old pattern wasn't working in gcc and it seems
the new one works for both gcc and MSVC.

git-svn-id: https://yabause.svn.sourceforge.net/svnroot/yabause/trunk@3102 d7be59e3-070e-4b9a-85a1-4646befae34d
Fixed bottom blending mode.

This fix the Kuro no Danshyou title screen.
(it may also break other games using bottom blending mode,
but I can't remember which games are using it...)

git-svn-id: https://yabause.svn.sourceforge.net/svnroot/yabause/trunk@3103 d7be59e3-070e-4b9a-85a1-4646befae34d