gles: fix regressions in negative api

These relate to some bound RBO == 0 invalid errors, and
returning the wrong error for wrong internalformat arguments.

Also, init the default width/height to zero for each framebuffer props object.

Bug: 186021150
Change-Id: Ic2090297cc5679171b96bd6c4a9ec293c87ddc1e
2 files changed