string-list API users: change confused remote.c user

Change a user of the string-list API in builtin/remote.c which
initialized with STRING_LIST_INIT_NODUP, and then right away did the
equivalent of having initialized with STRING_LIST_INIT_DUP by setting
the "strdup_strings" member to "1".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>

builtin/remote.c

@@ -1189,10 +1189,9 @@ static int get_one_entry(struct remote *remote, void *priv)
 
 static int show_all(void)
 {
-	struct string_list list = STRING_LIST_INIT_NODUP;
+	struct string_list list = STRING_LIST_INIT_DUP;
 	int result;
 
-	list.strdup_strings = 1;
 	result = for_each_remote(get_one_entry, &list);
 
 	if (!result) {