views/agenda: Cleanup unused Week View (!!!)

This is to show how much I suck at reviewing code. Look at this
massive gold nugget of garbage. Nobody on their serious mind would
have let that pass code review.

But I did. And now I deserve the punishment to deal with this.

Of course, the author didn't seem to have spared more than a fraction
of a second of their brain power to even consider what they were
doing here. But that's what code review is for - preventing garbage
like this from landing. And yet, here we are, removing an invisible
Week view from the sidebar.

src/gui/views/gcal-agenda-view.c

@@ -193,13 +193,6 @@ new_date_header_string (GDateTime *date)
  * Callbacks
  */
 
-static void
-on_event_activated (GcalAgendaView *self,
-                    GtkWidget      *widget)
-{
-  g_signal_emit_by_name (self, "event-activated", widget);
-}
-
 static void
 stack_visible_child_changed_cb (AdwViewStack   *stack,
                                 GParamSpec     *pspec,
@@ -726,8 +719,6 @@ gcal_agenda_view_class_init (GcalAgendaViewClass *klass)
   gtk_widget_class_bind_template_child (widget_class, GcalAgendaView, no_events_row);
   gtk_widget_class_bind_template_child (widget_class, GcalAgendaView, scrolled_window);
 
-  gtk_widget_class_bind_template_callback (widget_class, on_event_activated);
-
   gtk_widget_class_set_css_name (widget_class, "agenda-view");
 }