notificationDaemon: Use correct property name to enable markup

The property is named useBodyMarkup, not bannerMarkup. This was causing
markup to be disabled for FDO notifications.

Fixes: cc60ce7f94 ("notification: Stop using 'update()' from MessageTray.Notification")
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/7495
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3247>

js/ui/notificationDaemon.js

@@ -204,7 +204,7 @@ class FdoNotificationDaemon {
             title: summary,
             body,
             gicon,
-            bannerMarkup: true,
+            useBodyMarkup: true,
             sound: new MessageTray.Sound(soundFile, hints['sound-name']),
             acknowledged: false,
         });