badssl: re-enable RC4 test

This used to fail with an error indicating a mis-use of OpenSSL on platforms
using it due to poor error handling. Re-enable it even if this isn't the right
error code to use for now.

tests/online/badssl.c

@@ -67,9 +67,6 @@ void test_online_badssl__old_cipher(void)
 	git_clone_options opts = GIT_CLONE_OPTIONS_INIT;
 	opts.fetch_opts.callbacks.certificate_check = cert_check_assert_invalid;
 
-	/* FIXME: we don't actually reject RC4 anywhere, figure out what to tweak */
-	cl_skip();
-
 	if (!g_has_ssl)
 		cl_skip();