Code review comment for lp:~andreas-pokorny/mir/fix-1391975

I was thinking in a more pure sense that we should only aim to fix a bug in a bug fix and not enhance at the same time. So in that way, always requesting 64x64 would eliminate the need for all the drmGetCap stuff.

But yeah, if the goal is to enhance and add support for larger cursors in the future then you do need to do it this way.