fix(ui): username change no longer requires password confirmation

app/templates/settings.html

@@ -19,8 +19,6 @@
         <input type="text" value="{{ user.username }}" disabled>
         <label>新用户名</label>
         <input type="text" name="new_username" required maxlength="64" placeholder="输入新用户名">
-        <label>确认密码</label>
-        <input type="password" name="password" required placeholder="输入当前密码确认身份">
         <div class="form-actions">
             <button type="submit" class="btn btn-primary">修改用户名</button>
         </div>