Switch to buttons instead of A/B/X/Y for dinput.

This way people don't say "but my X button shows up as L1."

Windows/DinputDevice.cpp

@@ -36,19 +36,22 @@
 
 // In order from 0.  There can be 128, but most controllers do not have that many.
 static const int dinput_buttons[] = {
-	KEYCODE_BUTTON_Y,
-	KEYCODE_BUTTON_A,
-	KEYCODE_BUTTON_B,
-	KEYCODE_BUTTON_X,
-	KEYCODE_BUTTON_L2,
-	KEYCODE_BUTTON_R2,
-	KEYCODE_BUTTON_L1,
-	KEYCODE_BUTTON_R1,
-	KEYCODE_BUTTON_SELECT,
-	KEYCODE_BUTTON_START,
-	KEYCODE_BUTTON_THUMBL,
-	KEYCODE_BUTTON_THUMBR,
-	KEYCODE_BUTTON_Z,
+	KEYCODE_BUTTON_1,
+	KEYCODE_BUTTON_2,
+	KEYCODE_BUTTON_3,
+	KEYCODE_BUTTON_4,
+	KEYCODE_BUTTON_5,
+	KEYCODE_BUTTON_6,
+	KEYCODE_BUTTON_7,
+	KEYCODE_BUTTON_8,
+	KEYCODE_BUTTON_9,
+	KEYCODE_BUTTON_10,
+	KEYCODE_BUTTON_11,
+	KEYCODE_BUTTON_12,
+	KEYCODE_BUTTON_13,
+	KEYCODE_BUTTON_14,
+	KEYCODE_BUTTON_15,
+	KEYCODE_BUTTON_16,
 };
 
 static float NormalizedDeadzoneFilter(short value);