Revert "Add BoardConfig flag TARGET_USES_OPENGLES_FOR_SCREEN_CAPTURE"

So apparently this isn't needed. -_-
See: http://review.cyanogenmod.org/#/c/55376/

This reverts commit 05aff6836224f6a6cf648f2385535d1bf2a23fe7.

Change-Id: I119c476f403469a8102ac3207a6528e7efd697e3