Cleanup: Pass gpsTrackers directly to GpsListModel::update()

Instead of using the GpsLocation singleton in GpsListModel::update()
to extract the gpsTrackers, pass the gpsTrackers as function argument.

The caller has direct access to the GpsLocation object anyway and this
make things less entangled.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

qt-models/gpslistmodel.cpp

@@ -7,9 +7,8 @@ GpsListModel::GpsListModel(QObject *parent) : QAbstractListModel(parent)
 {
 }
 
-void GpsListModel::update()
+void GpsListModel::update(QVector<gpsTracker> trackers)
 {
-	QVector<gpsTracker> trackers = QVector<gpsTracker>::fromList(GpsLocation::instance()->currentGPSInfo().values());
 	beginResetModel();
 	m_gpsFixes = trackers;
 	endResetModel();