Ensure portrait node is removed from tree immediately

`queue_free()` only removes the node from the tree when it is freed. This
gives a problem in `change_speaker`, which assumes the first child of
the portrait container is the current speaker.

addons/dialogic/Modules/Character/subsystem_portraits.gd

@@ -214,6 +214,7 @@ func _change_portrait_z_index(character_node:Node2D, z_index:int, update_zindex:
 
 
 func _remove_portrait(character_node:Node2D) -> void:
+	character_node.get_parent().remove_child(character_node)
 	character_node.queue_free()