Fix enum in FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE query. We were using DEPTH_STENCIL instead of DEPTH_STENCIL_ATTACHMENT. BUG=angle:739 Change-Id: I0c746c374577dca2b965dfd7ccfac793f7075efb Reviewed-on: https://chromium-review.googlesource.com/218592 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>