Fix get_single_events to expand by default

(cherry picked from commit 40652f62)

CHANGELOG.rst

@@ -77,6 +77,7 @@ Fixed
 * [Dev] Do not exhaust PostgreSQL max_connections in development
 * Editing managed objects was possible in inline lists.
 * PDF generation took very long due to not properly closed selenium sessions
+* [Dev] `get_single_events` didn't expand events by default.
 
 Removed
 ~~~~~~~

aleksis/core/mixins.py

@@ -1015,7 +1015,7 @@ class CalendarEventMixin(DAVResource, RegistryObject, is_registry=True):
         params: dict[str, any] | None = None,
         with_reference_object: bool = False,
         queryset: Optional[QuerySet] = None,
-        expand: bool | None = False,
+        expand: bool | None = True,
         **kwargs,
     ):
         """Get single events for this calendar feed."""