Updated LoadAndSaveMetadata to return Optional type (but for real this time)

- fixed a typo i found
- awaiting dialog on invalid unpacked error
-

src/Ryujinx.HLE/FileSystem/ContentManager.cs

@@ -1059,7 +1059,7 @@ namespace Ryujinx.HLE.FileSystem
             }
         }
 
-        public static bool AreKeysAlredyPresent(string pathToCheck)
+        public static bool AreKeysAlreadyPresent(string pathToCheck)
         {
             string[] fileNames = ["prod.keys", "title.keys", "console.keys", "dev.keys"];
             foreach (string file in fileNames)