always initialize a configured path, not the default (#2949)

* use the users configuration

* linter

Author: ReimarBauer

mslib/msui/flighttrack.py

@@ -52,7 +52,6 @@
 from mslib.utils import thermolib
 from mslib.utils.verify_waypoint_data import verify_waypoint_data
 from mslib.utils.config import config_loader, save_settings_qsettings, load_settings_qsettings
-from mslib.utils.config import MSUIDefaultConfig as mss_default
 from mslib.utils.qt import variant_to_string, variant_to_float
 from mslib.msui.performance_settings import DEFAULT_PERFORMANCE
 
@@ -183,7 +182,8 @@ class WaypointsTableModel(QtCore.QAbstractTableModel):
     # Signal emitted when a waypoint is moved, inserted or deleted
     changeMessageSignal = QtCore.pyqtSignal(str)
 
-    def __init__(self, name="", filename=None, waypoints=None, mscolab_mode=False, data_dir=mss_default.mss_dir,
+    def __init__(self, name="", filename=None, waypoints=None, mscolab_mode=False,
+                 data_dir=config_loader(dataset="mss_dir"),
                  xml_content=None):
         super().__init__()
         self.name = name  # a name for this flight track