[GameSettings] Change remaining 0/1 bools to False/True

[bslenul]

Very minor PR to make game settings more consistent for some bools (MMU, CPUThread and LowDCBZHack), replacing 0/1 with False/True.

While searching for 0/1 bools I found 2 unused variables, UseDualCore and Patch Region, so:

Changed UseDualCore = 0 to CPUThread = False in GDV.ini (not even sure if it's needed? Couldn't find any info on the initial commit, on the wiki or the forums, tried a single race and it seemed fine with and without Dual Core, so idk...).

And removed the Patch Region line from GNWE69.ini, while I was at it I moved ImmediateXFBEnable = False from that same file to a new GNW.ini (unless there's a good reason this is only applied to the USA version?).

Hope this is fine!