Fixed issue monkeytypegame#3971 - active theme selection is properly removed (monkeytypegame#3972)

* fixed issue monkeytypegame#3971

* removed debug statement

Author: jerryzhou196

frontend/src/ts/settings/theme-picker.ts

@@ -21,8 +21,10 @@ export function updateActiveButton(): void {
   }
 
   document
-    .querySelector(`.pageSettings .section.themes .theme`)
-    ?.classList.remove("active");
+    .querySelectorAll(".pageSettings .section.themes .theme")
+    .forEach((el) => {
+      el.classList.remove("active");
+    });
   document
     .querySelector(
       `.pageSettings .section.themes .theme[theme='${activeThemeName}']`