Included hold_effects.h in battle_anim_new.c

Otherwise the file won't recognize HOLD_EFFECT_PLATE and will refuse to build a ROM.

src/battle_anim_new.c

@@ -14,6 +14,7 @@
 #include "battle_scripts.h"
 #include "battle_controllers.h"
 #include "constants/moves.h"
+#include "constants/hold_effects.h"
 
 //// function declarations
 static void SpriteCB_SpriteToCentreOfSide(struct Sprite* sprite);