Fix text not showing when clipped in raylib/microui example

[Tekkitslime]

• Have you added the example to the CI at .github/workflows/check.yml?

As the title says, the example didn't show long text correctly, so by moving the window around i figured that the clipping rectangle calculation is upside down.

[laytan]

This is not correct either

Screen.Recording.2024-10-13.at.20.54.21.mov

[Tekkitslime]

Now that's bizarre, works fine on my machine and i have no idea why... I'd play around with it if i could reproduce. I think this is raylib's scissor mode acting weird?

[Tekkitslime]

Could you try running it in software rendering mode? It still works if i run it with the LIBGL_ALWAYS_SOFTWARE=1 environment flag. also this is the opengl device info:

INFO: GL: OpenGL device information:
INFO:     > Vendor:   Mesa
INFO:     > Renderer: llvmpipe (LLVM 18.1.8, 256 bits)
INFO:     > Version:  4.5 (Core Profile) Mesa 24.2.5-arch1.1
INFO:     > GLSL:     4.50