Merged FORM_ITEM_HOLD_ABILITY into FORM_ITEM_HOLD

There was never a reason not to.

include/constants/pokemon.h

@@ -322,10 +322,9 @@
 #define FORM_ITEM_USE           2
 #define FORM_MOVE               3
 #define FORM_WITHDRAW           4
-#define FORM_ITEM_HOLD_ABILITY  5
-#define FORM_ITEM_USE_TIME      6
-#define FORM_BATTLE_BEGIN       7
-#define FORM_BATTLE_END         8
+#define FORM_ITEM_USE_TIME      5
+#define FORM_BATTLE_BEGIN       6
+#define FORM_BATTLE_END         7
 
 #define NUM_MALE_LINK_FACILITY_CLASSES   8
 #define NUM_FEMALE_LINK_FACILITY_CLASSES 8