[TASK] Drop removed configuration option from default TypoScript (#4276)

Followup to #4231

Author: oliverklee

CHANGELOG.md

@@ -53,7 +53,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ### Changed
 
 - !!! Always allow unregistration before the unregistration deadline even
-  with empty waiting list (#4231)
+  with empty waiting list (#4231, #4276)
 - Move some event fields to a new tab "information for attendees" (#4201)
 - Improve the hover texts in the BE module (#4195)
 - CSV-export the registration date by default (#4156)

Configuration/TypoScript/PluginShared.typoscript

@@ -72,10 +72,6 @@ plugin.tx_seminars {
   # whether registration for events without a date should be possible
   allowRegistrationForEventsWithoutDate = 0
 
-  # Whether unregistration is possible even when there are no registrations
-  # on the waiting list yet.
-  allowUnregistrationWithEmptyWaitingList = 0
-
   # whether to waiting list registrations automatically will succeed to regular registrations when someone unregisters
   # and hence a vacancy is created
   automaticallyFillVacanciesOnUnregistration = 1