application: Remove gcal_application_get_clock()

That moved to GcalContext, and now that all pieces who
used it have access to the context, we can just use it.

src/views/gcal-week-grid.c

@@ -1112,8 +1112,6 @@ gcal_week_grid_class_init (GcalWeekGridClass *klass)
 static void
 gcal_week_grid_init (GcalWeekGrid *self)
 {
-  GcalApplication *application;
-
   gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
 
   self->selection_start = -1;
@@ -1128,17 +1126,6 @@ gcal_week_grid_init (GcalWeekGrid *self)
                      NULL,
                      0,
                      GDK_ACTION_MOVE);
-
-  /* Connect to the wall clock */
-  application = GCAL_APPLICATION (g_application_get_default ());
-
-  g_assert (application != NULL);
-
-  g_signal_connect_object (gcal_application_get_clock (application),
-                           "minute-changed",
-                           G_CALLBACK (gtk_widget_queue_draw),
-                           self,
-                           G_CONNECT_SWAPPED);
 }
 
 /* Public API */
@@ -1149,6 +1136,12 @@ gcal_week_grid_set_context (GcalWeekGrid *self,
   g_return_if_fail (GCAL_IS_WEEK_GRID (self));
 
   self->context = context;
+
+  g_signal_connect_object (gcal_context_get_clock (context),
+                           "minute-changed",
+                           G_CALLBACK (gtk_widget_queue_draw),
+                           self,
+                           G_CONNECT_SWAPPED);
 }
 
 void