fix(account page): tidy up highest wpm description (@Cosmatevs) (monkeytypegame#6329)

### Description
Account page:
* remove unnecessary &
![& in highest wpm
description](https://github.com/user-attachments/assets/61e01116-2db8-4a80-93f0-c204c6e3349a)
* build punctuation and number strings only if they're going to be used

### Checks
- [x] Check if any open issues are related to this PR; if so, be sure to
tag them below.
- [x] Make sure the PR title follows the Conventional Commits standard.
(https://www.conventionalcommits.org for more info)
- [x] Make sure to include your GitHub username prefixed with @ inside
parentheses at the end of the PR title.

Author: Cosmatevs

frontend/src/ts/pages/account.ts

@@ -645,13 +645,12 @@ async function fillContent(): Promise<void> {
     });
 
     if (result.wpm > topWpm) {
-      const puncsctring = result.punctuation ? ",<br>with punctuation" : "";
-      const numbsctring = result.numbers
-        ? ",<br> " + (result.punctuation ? "&" : "") + "with numbers"
-        : "";
       topWpm = result.wpm;
-      if (result.mode === "custom") topMode = result.mode;
-      else {
+      if (result.mode === "custom") {
+        topMode = result.mode;
+      } else {
+        const puncsctring = result.punctuation ? ",<br>with punctuation" : "";
+        const numbsctring = result.numbers ? ",<br>with numbers" : "";
         topMode = result.mode + " " + result.mode2 + puncsctring + numbsctring;
       }
     }