tests/framebuffer: Remove dead minui.h.

commit 480a3b1c6d5413e06775a9d53cb1596535fd91ae removed the last user of
this local minui.h copy in 2011.

Test: mmma system/extras/tests/framebuffer
Change-Id: Iee42ef604616dc539d4a1699ada7209c48c3bcd9
1 file changed