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Deobfuscate a value without affecting ASM

Doing 'fx / 32 / 0x200' produces different assembly.

--- a/src/Back.cpp

+++ b/src/Back.cpp

@@ -179,7 +179,7 @@

 	switch (gBack.type)

 	{

 		case 3:

-			x_1 = fx / 0x4000;

+			x_1 = fx / (32 * 0x200);

 			x_2 = x_1 + (((WINDOW_WIDTH + (32 - 1)) / 32) + 1);

 			y_1 = 0;

 			y_2 = y_1 + 32;