handle giveKeyChainTriggeredMessage with ChainStage = -1

e.g. for railjack build quest, the initial inbox message is sent like this. no 'm' needs to be set to true for it.

src/services/questService.ts

@@ -83,11 +83,13 @@ export const updateQuestStage = (
             `Quest stage index mismatch: stage is ${ChainStage} but array size is ${quest.Progress.length}`
         );
     }
+    if (ChainStage >= 0) {
         const questStage = quest.Progress[ChainStage]; // guaranteed in-bounds now
 
         for (const [key, value] of Object.entries(questStageUpdate) as [keyof IQuestStage, number | boolean | any[]][]) {
             (questStage[key] as any) = value;
         }
+    }
 };
 
 export const addQuestKey = (