fix(users): fixed password mismatch error message beeing wrongly displayed when creating new users

rhodecode/templates/admin/users/user_add.mako

@@ -44,6 +44,8 b''
                 </div>
                 <div class="input">
                     ${h.password('password', class_='medium')}
+                    ## install this hidden field so password mismatch will correctly attach error message here
+                    ${h.hidden('new_password')}
                 </div>
              </div>