Removed unused css class from icon

src/main/frontend/chat/main.ts

@@ -99,10 +99,10 @@ Handlebars.registerHelper("msgDateFormat", function (date: string) {
 Handlebars.registerHelper("lockIcon", function (unlocked: boolean) {
   switch (unlocked) {
     case true: {
-      return '<i class="fas fa-lock-open user-passphrase"></i>';
+      return '<i class="fas fa-lock-open"></i>';
     }
     default: {
-      return '<i class="fas fa-lock user-passphrase"></i>';
+      return '<i class="fas fa-lock"></i>';
     }
   }
 });