Set initial name of exported trajectory

Author: jlbabilino

app/src/main/java/org/team2363/helixnavigator/ui/editor/toolbar/TrajectoryToolBar.java

@@ -85,6 +85,7 @@ public TrajectoryToolBar(DocumentManager documentManager) {
                 HTrajectory traj = this.documentManager.getDocument().getSelectedPath().getTrajectory();
                 FileChooser chooser = new FileChooser();
                 chooser.getExtensionFilters().add(Standards.TRAJECTORY_FILE_TYPE);
+                chooser.setInitialFileName(this.documentManager.getDocument().getSaveLocation().getName());
                 File result = chooser.showSaveDialog(this.documentManager.getStage());
                 if (result != null) {
                     try {