Add RT130 experiment number to file info widget

Closes #72 (closed)

sohstationviewer/view/file_information/get_file_information.py

 from typing import Union, Dict, List, Set, Tuple
 
-from PySide2.QtWidgets import QTextBrowser
-
 from sohstationviewer.controller.plotting_data import format_time
 from sohstationviewer.model.data_type_model import DataTypeModel
 from sohstationviewer.model.mseed.mseed import MSeed
@@ -10,7 +8,8 @@ from sohstationviewer.view.util.functions import extract_netcodes
 
 
 def extract_data_set_info(data_obj: Union[DataTypeModel, RT130, MSeed],
-                          date_format: str) -> Dict[str, Union[str, List[str]]]:
+                          date_format: str
+                          ) -> Dict[str, Union[str, List[str]]]:
     """
     Extract information about a data set. The extracted information includes:
         - Sources read