builtin/worktree.c: fix typo in "forgot fetch" msg

Replace misspelled word "overide" with correctly spelled "override".

Reported-By: Teng Long <dyroneteng@gmail.com>
Signed-off-by: Jacob Abel <jacobabel@nullpo.dev>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/worktree.c

@@ -691,7 +691,7 @@ static int can_use_remote_refs(const struct add_opts *opts)
 		return 1;
 	} else if (!opts->force && remote_get(NULL)) {
 		die(_("No local or remote refs exist despite at least one remote\n"
-		      "present, stopping; use 'add -f' to overide or fetch a remote first"));
+		      "present, stopping; use 'add -f' to override or fetch a remote first"));
 	}
 	return 0;
 }