main-window: Display the dialer on startup rather than empty history

When call history is implemented, this should be modified to only
display the dialer if the history is empty.

src/calls-main-window.c

@@ -518,6 +518,11 @@ constructed (GObject *object)
                                   G_ACTION_GROUP (simple_action_group));
   g_object_unref (simple_action_group);
 
+  // FIXME: if (no history)
+  {
+    new_call_action (NULL, NULL, self);
+  }
+
   parent_class->constructed (object);
 }