endSessionDialog: Only show logout inhibiting apps

Apps that only inhibit other kinds of activity (like idle or suspend)
don't need to be shown to user when they are logging out.

https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3119

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1424>

js/misc/gnomeSession.js

@@ -1,5 +1,5 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
-/* exported PresenceStatus, Presence, Inhibitor, SessionManager */
+/* exported PresenceStatus, Presence, Inhibitor, SessionManager, InhibitFlags */
 
 const Gio = imports.gi.Gio;
 
@@ -35,3 +35,11 @@ var SessionManagerProxy = Gio.DBusProxy.makeProxyWrapper(SessionManagerIface);
 function SessionManager(initCallback, cancellable) {
     return new SessionManagerProxy(Gio.DBus.session, 'org.gnome.SessionManager', '/org/gnome/SessionManager', initCallback, cancellable);
 }
+
+var InhibitFlags = {
+    LOGOUT: 1 << 0,
+    SWITCH: 1 << 1,
+    SUSPEND: 1 << 2,
+    IDLE: 1 << 3,
+    AUTOMOUNT: 1 << 4,
+};