Use descriptive constant for ScriptGiveMon call

src/battle_setup.c

@@ -897,7 +897,7 @@ static void CB2_GiveStarter(void)
 
     *GetVarPointer(VAR_STARTER_MON) = gSpecialVar_Result;
     starterMon = GetStarterPokemon(gSpecialVar_Result);
-    ScriptGiveMon(starterMon, 5, 0, 0, 0, 0);
+    ScriptGiveMon(starterMon, 5, ITEM_NONE, 0, 0, 0);
     ResetTasks();
     PlayBattleBGM();
     SetMainCallback2(CB2_StartFirstBattle);