event-editor/summary-section: Remove automatic focus grabbing when setting event

This is no longer needed as it was replaced by the
`grab_focus()` override.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/782>

src/gui/event-editor/gcal-summary-section.c

@@ -66,8 +66,6 @@ gcal_reminders_section_set_event (GcalEventEditorSection *section,
   gtk_editable_set_text (GTK_EDITABLE (self->summary_entry), gcal_event_get_summary (event));
   gtk_editable_set_text (GTK_EDITABLE (self->location_entry), gcal_event_get_location (event));
 
-  gtk_widget_grab_focus (GTK_WIDGET (self->summary_entry));
-
   gtk_widget_remove_css_class (GTK_WIDGET (self->summary_entry), "error");
 
   GCAL_EXIT;