Add some missing battle arena constants

include/battle_arena.h

@@ -1,6 +1,8 @@
 #ifndef GUARD_BATTLE_ARENA_H
 #define GUARD_BATTLE_ARENA_H
 
+#include "constants/battle_arena.h"
+
 void CallBattleArenaFunction(void);
 u8 BattleArena_ShowJudgmentWindow(u8 *state);
 void BattleArena_InitPoints(void);