glthread: unbind framebuffers in glDeleteFramebuffers
Tests: dEQP-GLES2.functional.lifetime.delete_bound.framebuffer dEQP-GLES2.functional.state_query.integers.framebuffer_binding_getinteger Fixes: e48f6768 - glthread: don't sync for more glGetIntegerv enums for glretrace Reviewed-by:Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> Part-of: <mesa/mesa!17976> (cherry picked from commit eb4036ea)