irc/polari: add missing USE_GNOME=libadwaita

Otherwise fails to run:

% polari

(polari:36417): Gjs-CRITICAL **: 16:32:52.548: JS ERROR: Error: Requiring Adw, version none: Typelib file for namespace 'Adw' (any version) not found
require@resource:///org/gnome/gjs/modules/esm/gi.js:16:28
@gi://Adw:3:25

** Message: 16:32:52.550: Execution of main.js threw exception: Module <main> threw an exception

irc/polari/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	polari
 PORTVERSION=	42.1
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	irc gnome
 MASTER_SITES=	GNOME/sources/${PORTNAME}/${PORTVERSION:C/^([0-9]+)\..*/\1/}
 DIST_SUBDIR=	gnome
@@ -26,7 +26,7 @@ PORTSCOUT=	limitw:1,even
 
 USES=		desktop-file-utils gettext gnome localbase \
 		meson pkgconfig tar:xz
-USE_GNOME=	cairo gtk30 introspection
+USE_GNOME=	cairo gtk30 introspection libadwaita
 USE_LDCONFIG=	yes
 
 GLIB_SCHEMAS=	org.gnome.Polari.gschema.xml