fix frame dumping and screenshots in d3d9 and opengl
some improvements to the new efb to ram
please test to see if the issues introduced by the new efb to ram are solved by this commit
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5862 8ced0084-cf51-0410-be5f-012b33b47a6e