fix: missing > and use proper pref definition for dropdown (#840)

* fix: new pref definition system

* Update adjust-security-and-privacy-page.patch

* Update adjust-security-and-privacy-page.patch

Author: RKNF404

patches/trivalent/ui/adjust-security-and-privacy-page.patch

@@ -216,8 +216,8 @@ index 6b9bd1adee..6e0bea5eee 100644
 +        </div>
 +        <settings-dropdown-menu
 +          label="$i18n{webrtcHandlingPolicyLabel}"
-+          pref="{{prefs.webrtc.ip_handling_policy}}"
-+          .menuOptions="[[webrtcHandlingPolicyOptions_]]"
++          pref-key="webrtc.ip_handling_policy"
++          menu-options="[[webrtcHandlingPolicyOptions_]]">
 +        </settings-dropdown-menu>
 +      </div>
 +<if expr="is_linux or is_win">