Fix 320x240 touch buttons Y (#20079)

Marlin/src/lcd/touch/touch_buttons.h

@@ -47,7 +47,7 @@
 #define BUTTONC_X_LO BUTTONB_X_HI + BUTTON_SPACING
 #define BUTTONC_X_HI BUTTONC_X_LO + BUTTON_WIDTH - 1
 
-#define BUTTON_Y_HI (TFT_HEIGHT) - (BUTTON_SPACING / 2)
+#define BUTTON_Y_HI (TFT_HEIGHT) - BUTTON_SPACING
 #define BUTTON_Y_LO BUTTON_Y_HI - BUTTON_HEIGHT
 
 class TouchButtons {