Pass selected_rt130_paths to check_folders_size() as paths of data if DAS S/N shows in file list

closes #271 (closed)

Using selected_rt130_paths as list_of_dirs to pass to check_folders_size() to fix bug that list_of_dir is empty when DAS S/N is displayed.

sohstationviewer/view/main_window.py

@@ -554,6 +554,10 @@ class MainWindow(QtWidgets.QMainWindow, UIMainWindow):
                 # each item.file_path is a rt130 das name for this case
                 self.selected_rt130_paths += self.rt130_das_dict[
                     item.file_path]
+
+                # Checking size of files using list of dir
+                self.list_of_dir = self.selected_rt130_paths
+
             if self.selected_rt130_paths == []:
                 msg = "No RT130s have been selected."
                 raise Exception(msg)