Fix spacing, use single instances of similar pins

Marlin/pins_GT2560_REV_A.h

@@ -98,33 +98,24 @@
 
   #if ENABLED(NEWPANEL)
 
-  #if ENABLED(MKS_MINI_12864)
-      #define DOGLCD_A0         5
-      #define DOGLCD_CS         21
-
-      #define BTN_EN1           40
-      #define BTN_EN2           42
-      #define BTN_ENC           19
-
-      #define SDSS              53
-      #define SD_DETECT_PIN     38
-  #else
-
-      #define LCD_PINS_RS    20
+    #if ENABLED(MKS_MINI_12864)
+      #define DOGLCD_A0     5
+      #define DOGLCD_CS    21
+      #define BTN_EN1      40
+      #define BTN_EN2      42
+    #else
+      #define LCD_PINS_RS  20
       #define LCD_PINS_ENABLE 17
-      #define LCD_PINS_D4    16
-      #define LCD_PINS_D5    21
-      #define LCD_PINS_D6     5
-      #define LCD_PINS_D7     6
-
-      // Buttons are directly attached
-      #define BTN_EN1        42
-      #define BTN_EN2        40
-      #define BTN_ENC        19
-
-      #define SD_DETECT_PIN  38
-
-  #endif
+      #define LCD_PINS_D4  16
+      #define LCD_PINS_D5  21
+      #define LCD_PINS_D6   5
+      #define LCD_PINS_D7   6
+      #define BTN_EN1      42
+      #define BTN_EN2      40
+    #endif
+
+    #define BTN_ENC        19
+    #define SD_DETECT_PIN  38
 
   #else // !NEWPANEL