[ReceiveNotifications] Honor silent property

Summary: Don't show silent notifications. With D17776 we don't send silent any more, but we might again in the future.

Reviewers: #kde_connect, albertvaka

Reviewed By: #kde_connect, albertvaka

Subscribers: kdeconnect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D17777

src/org/kde/kdeconnect/Plugins/ReceiveNotificationsPlugin/ReceiveNotificationsPlugin.java

@@ -75,6 +75,10 @@ public class ReceiveNotificationsPlugin extends Plugin {
             return true;
         }
 
+        if (np.getBoolean("silent", false)) {
+            return true;
+        }
+
         PendingIntent resultPendingIntent = PendingIntent.getActivity(
                 context,
                 0,