merge-tree: only use basic merge config

Commit 9c93ba4 (merge-recursive: honor diff.algorithm, 2024-07-13)
replaced init_merge_options() with init_basic_merge_config() for use in
plumbing commands and init_ui_merge_config() for use in porcelain
commands. As "git merge-tree" is a plumbing command it should call
init_basic_merge_config() rather than init_ui_merge_config(). The merge
ort machinery ignores "diff.algorithm" so the behavior is unchanged by
this commit but it future proofs us against any future changes to
init_ui_merge_config().

Signed-off-by: Phillip Wood <[email protected]>

Author: phillipwood

builtin/merge-tree.c

@@ -576,7 +576,7 @@ int cmd_merge_tree(int argc,
 	};
 
 	/* Init merge options */
-	init_ui_merge_options(&o.merge_options, the_repository);
+	init_basic_merge_options(&o.merge_options, the_repository);
 
 	/* Parse arguments */
 	original_argc = argc - 1; /* ignoring argv[0] */