Simplify enabling/disabling textures in the engine

**Task (REQUIRED):**
From a comment in the recent compute shader PR (https://github.com/defold/defold/pull/8975):

"Would be nice to have a dmGraphics::DisableTextures() to void any mishaps. Of course, then the opengl backend would have to keep track of the enabling of textures.

I just don't like the complexity involved in both the enable/disable. Perhaps they could be part of the same helper function: EnableOrDisableTextures(render_context_textures, count, true)
And inside that function check the "if (enable) { enable stuff} else { disable stuff }" in order to keep the loops the same."