Fix minimum caps for draw buffers and compute invocations. Framebuffer and blend state code asserts that draw buffers > 0 so unconditionally set it to 1. It's increased to 4 in the ES3 block. Fix the value of MAX_COMPUTE_WORK_GROUP_INVOCATIONS, it was incorrectly copied from the spec. Bug: angleproject:40096373 Change-Id: I471fa7e8dddd9bca755daf8ce5834ed60ec4e629 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6052094 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Stephen White <senorblanco@chromium.org>