Fix client reconnection after page refresh (#3117)

## Description:

- Removed all code related to generating a client ID on the client. The
server now assigns the client ID and sends it to the client in lobby
messages.

## 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:

w.o.n

src/client/SinglePlayerModal.ts

@@ -912,7 +912,6 @@ export class SinglePlayerModal extends BaseModal {
     this.dispatchEvent(
       new CustomEvent("join-lobby", {
         detail: {
-          clientID: clientID,
           gameID: gameID,
           gameStartInfo: {
             gameID: gameID,