Only post message if connection to child was lost

If the connection to the child was intentionally severed, do not
post a "disconnected" message, as the activity is likely closing.

src/protect/babymonitor/ListenActivity.java

@@ -139,6 +139,9 @@ public class ListenActivity extends Activity
                     Log.e(TAG, "Failed to stream audio", e);
                 }
 
+                if(Thread.currentThread().isInterrupted() == false)
+                {
+
                     ListenActivity.this.runOnUiThread(new Runnable()
                     {
                         @Override
@@ -152,6 +155,7 @@ public class ListenActivity extends Activity
                         }
                     });
                 }
+            }
         });
 
         _listenThread.start();