bug(timetable): don't add Bedford room to year ics

timetabling/timetable-ics.py

@@ -126,6 +126,7 @@ for ttfile in timetable_files:
                 for year in get_years(name):
                     cals[year].events.add(event)
                 if "bedford" in location.lower():
+                    event = event.clone()
                     if "04-06" in location:
                         event.name = f"ALL {name}"
                     elif "04" in location: