Update FirmwareDatabase.cs

[BlackWinnerYoshi]

Fixes most of the nonsense found here (such as the GBA BIOS being OK despite being the only real choice), although MSX bios_basic_usa is still split in two for whatever reason, but I did verify the TI83 roms (and removed the Plus ones that don't work atm)

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• I have run any relevant test suites
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