NotificationHelper: don't send notification if it's from muted thread

app/src/main/java/com/keylesspalace/tusky/util/NotificationHelper.java

@@ -144,6 +144,12 @@ public class NotificationHelper {
             return;
         }
         
+        if (body.getStatus() != null
+            && body.getStatus().getPleroma() != null
+            && body.getStatus().getPleroma().getThreadMuted() == true) {
+            return;
+        }
+
         String rawCurrentNotifications = account.getActiveNotifications();
         JSONArray currentNotifications;
         BidiFormatter bidiFormatter = BidiFormatter.getInstance();