Fix the 2 frames of input lag on the GL renderer

[Immersion95]

I just backported the fix that was present on the compute shader renderer branch, none of this is my work. I built it and it seems to work just fine.

I know that it is planned on the big refactoring but the input lag is present on the GL renderer since 2021, hope this is merged 😊.

"Don't double buffer 3D framebuffers for the GL Renderer - Looks like leftovers from when 3D+2D composition was done in the frontend".

The fix is from @RSDuck - Thanks a lot man ! By the way I'm French and it's "Ne jamais toucher la lentille." - "Lentile" doesn't exist 😭.

Closes https://github.com/melonDS-emu/melonDS/issues/1120