DirectoryTree.clear_node doesn't actually clear the node

[rodrigogiraoserrao]

The current implementation of DirectoryTree.clear_node assigns to node but then does nothing with it, which means it doesn't really clear the node passed in:

textual/src/textual/widgets/_directory_tree.py

Lines 188 to 208 in ca2c11b

	def clear_node(self, node: TreeNode[DirEntry]) -> Self:
	"""Clear all nodes under the given node.
	Returns:
	The `Tree` instance.
	"""
	self._clear_line_cache()
	node_label = node._label
	node_data = node.data
	node_parent = node.parent
	node = TreeNode(
	self,
	node_parent,
	self._new_id(),
	node_label,
	node_data,
	expanded=True,
	)
	self._updates += 1
	self.refresh()
	return self

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