Change join-changed event listener to fix Game Replay functionality (#2968)

Resolves #2967 

## Description:

The "Replay" action on recent games doesn't work anymore after the
release of v29.

The problem arises because `AccountModal.viewGame()` correctly calls
`history.pushState()` with the game URL and then dispatches the
`join-changed` event.
The `join-changed` event listener in `Main.ts` calls `onHashUpdate()`,
which first calls `JoinPrivateLobbyModal.close()` and then handles the
new URL.

The problem is that `JoinPrivateLobbyModal.onClose()` resets the modal
UI, but also replaces the history state with `/`, therefore
`handleUrl()` receives the homepage URL instead of the game URL.

This PR fixes the above by creating a dedicated callback for the
`join-changed` event (which is dispatched only by `AccountModal` ATM),
skipping the `JoinPrivateLobbyModal.close()` call.

## 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

## Please put your Discord username so you can be contacted if a bug or
regression is found:

deshack_82603

src/client/Main.ts

@@ -588,12 +588,8 @@ class Client {
     const onHashUpdate = () => {
       // Reset the UI to its initial state
       this.joinModal?.close();
-      if (this.gameStop !== null) {
-        this.handleLeaveLobby();
-      }
 
-      // Attempt to join lobby
-      this.handleUrl();
+      onJoinChanged();
     };
 
     const onPopState = () => {
@@ -627,10 +623,19 @@ class Client {
       }
     };
 
+    const onJoinChanged = () => {
+      if (this.gameStop !== null) {
+        this.handleLeaveLobby();
+      }
+
+      // Attempt to join lobby
+      this.handleUrl();
+    };
+
     // Handle browser navigation & manual hash edits
     window.addEventListener("popstate", onPopState);
     window.addEventListener("hashchange", onHashUpdate);
-    window.addEventListener("join-changed", onHashUpdate);
+    window.addEventListener("join-changed", onJoinChanged);
 
     function updateSliderProgress(slider: HTMLInputElement) {
       const percent =