Change signedness and add casts to avoid implicit conversion warnings

src/battle_anim_effects_1.c

@@ -4445,7 +4445,7 @@ static void AnimBowMon_Step1_Callback(struct Sprite* sprite)
     {
         sprite->data[3] = gBattlerSpriteIds[gBattleAnimAttacker];
         PrepareBattlerSpriteForRotScale(sprite->data[3], ST_OAM_OBJ_NORMAL);
-        sprite->data[4] = (sprite->data[6] = GetBattlerSide(gBattleAnimAttacker)) ? 0x300 : 0xFFFFFD00;
+        sprite->data[4] = (sprite->data[6] = GetBattlerSide(gBattleAnimAttacker)) ? 0x300 : (s16)0xFFFFFD00;
         sprite->data[5] = 0;
     }