event-editor/event-editor-dialog: Unset sensitiveness of widgets

Only GcalCalendarComboRow, GcalAttendeesSection, and GcalRemindersSection
remain unfocusable on read-only events.

In the case of GcalRemindersSection, we eventually want to allow setting
reminders regardless of the writable state of the event; however, since
dialog is centered around the assumption that a read-only event should
never be edited, which includes reminders, these changes will have to be
done in a separate merge request.

Closes: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/work_items/737>
Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/499>

src/gui/event-editor/gcal-event-editor-dialog.blp

@@ -38,7 +38,6 @@ template $GcalEventEditorDialog: Adw.Dialog {
           };
 
           $GcalSummarySection summary_section {
-            sensitive: bind template.writable;
             dialog: template;
           }
 
@@ -49,7 +48,6 @@ template $GcalEventEditorDialog: Adw.Dialog {
           }
 
           $GcalScheduleSection {
-            sensitive: bind template.writable;
             dialog: template;
           }
 
@@ -65,7 +63,6 @@ template $GcalEventEditorDialog: Adw.Dialog {
           }
 
           $GcalNotesSection {
-            sensitive: bind template.writable;
             dialog: template;
           }