custom flag (2) (#1303)

## Description:

This PR implements the permission check logic.

Other related parts will be handled in a separate UI update.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

src/core/game/GameView.ts

@@ -1,3 +1,4 @@
+import { base64url } from "jose";
 import { Config } from "../configuration/Config";
 import { PatternDecoder } from "../PatternDecoder";
 import { ClientID, GameID, Player } from "../Schemas";
@@ -163,7 +164,7 @@ export class PlayerView {
     this.decoder =
       this.cosmetics.pattern === undefined
         ? undefined
-        : new PatternDecoder(this.cosmetics.pattern);
+        : new PatternDecoder(this.cosmetics.pattern, base64url.decode);
   }
 
   patternDecoder(): PatternDecoder | undefined {