OBJ_LOADER_DEMO: Deferred shading can't have alpha
OBJ_LOADER_DEMO: Clear resource bindings so they don't interfere with the next part of the pipeline
OBJ_LOADER_DEMO: Fix a comment to correspond to the correct render target name
OBJ_LOADER_DEMO: Allow TiledCull to show all the gbuffers
OBJ_LOADER_DEMO: Force the PostProcess to not blend

There were some issues where text rendering left the blend state with Blend
enabled. However, the alpha values of the HDR target don't matter at this point
of the pipeline. So we want to force everything to opaque.