Show state of Accurate LLVM DFMA option in GUI for CPUs that support FMA

[RainbowCookie32]

Follow-up to #7981

If you had a CPU with FMA support, the option was greyed out and it was showed as unchecked. This PR aims to fix that. It also tweaks the tooltip for the option a bit to reflect that you can't disable it if your CPU has FMA support, and simplifies the code.

Master:

This PR:

Waiting for my Amazing Contribution label, tyvm

[Yahfz]

Performance is better if the cpu supports fma, so maybe try to include that first? It prevents users from trying to disable it in the config file even on cpus that support it.

[RainbowCookie32]

Maybe changing it to

Provides extra accuracy on FMA instructions at the cost of performance in CPUs that don't support it.
While disabling it might give a decent performance boost, it may also introduce subtle bugs that otherwise do not occur.
You can't disable it if your CPU supports FMA.

I'm open to suggestions

[illusion0001]

Thanks 😻

[vsub]

@RainbowCookie32

Provides extra accuracy on FMA instructions at the cost of performance in CPUs that don't support it.
While disabling it might give a decent performance boost, it may also introduce subtle bugs that otherwise do not occur.
You can't disable it if your CPU supports FMA.

I prefer the old description.
This one made me think,I may get some decent performance boost even if my cpu support it by disabling it and most users first care about speed than accuracy

They both say the same thing but while reading a new sentence without paying much attention,you may ignore what the last one was saying,