[libc++] Optimize __tree::__copy_construct_tree further

[philnik777]

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You can test this locally with the following command:

git-clang-format --diff origin/main HEAD --extensions  -- libcxx/include/__tree

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View the diff from clang-format here.

diff --git a/libcxx/include/__tree b/libcxx/include/__tree
index 0660e9005..336ecf5dd 100644
--- a/libcxx/include/__tree
+++ b/libcxx/include/__tree
@@ -1349,8 +1349,7 @@ private:
 #ifdef _LIBCPP_COMPILER_CLANG_BASED // FIXME: GCC complains about not being able to always_inline a recursive function
   _LIBCPP_HIDE_FROM_ABI
 #endif
-  __node_pointer
-  __copy_construct_tree_impl(__node_pointer __src) {
+  __node_pointer __copy_construct_tree_impl(__node_pointer __src) {
     __node_holder __new_node = __construct_node(__src->__get_value());
 
     unique_ptr<__node, __tree_deleter> __left(