Fixes bug where mVertexAttribsNeedsTranslation was not being set when
vertex attribute changes internally from DIRECT to DYNAMIC. This changes
mVertexAttribsNeedTranslation to be set during any change in vertex
attribute type.

BUG=angleproject:2381

Change-Id: I91ae86624f0cb68bd8c41c3bcbdeb31fa1ccd9ed
Reviewed-on: https://chromium-review.googlesource.com/951894
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>