Clean up Context by replacing foo ? GL_TRUE : GL_FALSE by
ConvertToGLBoolean(foo);

Change-Id: I6a6ee9c23bb30d8b4ef43371c04a94578758145e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1626309Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>