[Keyboard] PDBDOWN should be PCBDOWN. (#9192)

keyboards/atreus/astar_mirrored/config.h

@@ -28,7 +28,7 @@
  *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
  *
 */
-#define PDBDOWN 1
+#define PCBDOWN 1
 
 #define MATRIX_ROW_PINS { D0, D1, D3, D2 }
 #define MATRIX_COL_PINS { B7, D6, F7, F6, B6, D4, E6, B4, B5, C6, D7 }