Fix HTML on change password page

The password restrictions are in <dt>/<dd> tags, but weren't inside a
<dl>.

tildes/tildes/templates/settings_password_change.jinja2

@@ -37,6 +37,8 @@
 </form>
 
 <div class="divider"></div>
+<dl>
 {% include 'includes/password_restrictions.jinja2' %}
+</dl>
 
 {% endblock %}