GUI: Use 4 digit year

gui/src/aaregui/panels/file_path_panel.py

@@ -24,7 +24,7 @@ class FilePathPanel(QWidget):
         self.__puck_pos = 0
 
         self.__filename = ""
-        self.__formatted_date = datetime.now().strftime('%y%m%d')
+        self.__formatted_date = datetime.now().strftime('%Y%m%d')
 
         grid_layout.addWidget(TitleLabel("Dataset path", self), 0, 0, 1, 2)