Only dump 64 MiB for Face Training

GBATEK says 82 MB RW section but now how much is save, nocash said 66 MB is save(?) on nesdev, but then melonDS makes a 64 MB save, since melonDS seems to work I'm just going to lower this to 64 MB incase going further can cause trouble.

arm9/source/dumpOperations.cpp

@@ -194,7 +194,7 @@ u32 cardNandGetSaveSize(void) {
 		case 0x00524F55: // 'UOR'
 			return 16 << 20; // 16MByte - WarioWare D.I.Y.
 		case 0x004B5355: // 'USK'
-			return 82 << 20; // 82MByte - Face Training
+			return 64 << 20; // 64MByte - Face Training
 	}
 
 	return 0;