OpenGL: Remove avoidDXT1sRGBTextureFormat workaround Bug: angleproject:5543 Change-Id: I2a7e2d563aa60e6e53dd6b6c32fbc449368e4e06 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2627425 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org> Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>