🩹 Fix Ender 2 Pro EXP1-7 pin (PB15 / LCD_RS) (#27074)

Author: jam-berg

Marlin/src/pins/hc32f4/pins_CREALITY_ENDER2P_V24S4.h

@@ -188,7 +188,7 @@
  *   PC6  | 1  2 | PC7
  *   PA2  | 3  4 | PA3
  *   PB13   5  6 | PB14
- *   N/C  | 7  8 | PB12
+ *   PB15 | 7  8 | PB12
  *   GND  | 9 10 | 5V
  *         ------
  *          EXP1
@@ -199,7 +199,7 @@
 #define EXP1_04_PIN                         PA3
 #define EXP1_05_PIN                         PB13
 #define EXP1_06_PIN                         PB14
-#define EXP1_07_PIN                         -1
+#define EXP1_07_PIN                         PB15
 #define EXP1_08_PIN                         PB12
 
 #if ENABLED(CR10_STOCKDISPLAY)                    // LCD used for C2