Summary

1. Disable the "Enable Discord integration" menu item if the Discord library fails to load
2. Mark the Quadtel 286 clone as requiring SoftFloat FPU to make the "80287 internal register error" go away
3. Dev branch only: Fix the GUS MAX's CS4231 codec using the incorrect DMA channel for playback; add support for the correct (GF1's record) channel

Checklist

• Closes Quadtel 286 errors at POST if FPU is installed #2274
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set

References

For item 3: UltraSound Lowlevel ToolKit, Revision 2.22, page 123 (129) - "Note that the DMA channels appear flipped between the GF1 and the codec. This is to allow us to DMA to dram to load patches while the codec is busy playing back .WAV data."