Put back minimum window sizes on 320x240.
This didnt work well with making blender areas into windows.

Real fix: check such minimums based on what's in the window itself... or just
make scaling work flawless.



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54084 954f8c5b-7b00-dc11-b283-0030488c597c