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Fix MMC1 32KB PRG-ROM bank switching
selectPRGPage32KBwas copying PRG-ROM data directly without proper bank wrapping, causing incorrect memory mapping in MMC1's 32KB mode. The fix reimplements it to callselectPRGPage16KBtwice, reusing the existing bank-wrapping logic.The bank wrapping in
selectPRGPage16KBis also corrected to always count 16KB banks from the actual ROM size, rather than relying on the mapper's native bank size.For MMC1, the 32KB mode now properly converts the 16KB-based prgbank value to a 32KB bank index.