MAVLinkProtocol: Remove QString constructor with tr

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/comm/MAVLinkProtocol.cc

@@ -345,7 +345,7 @@ void MAVLinkProtocol::receiveBytes(LinkInterface* link, QByteArray b)
  **/
 QString MAVLinkProtocol::getName()
 {
-    return QString(tr("MAVLink protocol"));
+    return tr("MAVLink protocol");
 }
 
 /** @return System id of this application */