fix ban.list obj.http.* rendering

Fixes #2985

bin/varnishd/cache/cache_ban.c

@@ -798,7 +798,7 @@ ban_render(struct cli *cli, const uint8_t *bs, int quote)
 		ASSERT_BAN_OPER(bt.oper);
 
 		if (BANS_HAS_ARG1_SPEC(bt.arg1))
-			VCLI_Out(cli, "%s.%.*s",
+			VCLI_Out(cli, "%s%.*s",
 			    arg_name[BAN_ARGIDX(bt.arg1)],
 			    bt.arg1_spec[0] - 1, bt.arg1_spec + 1);
 		else

bin/varnishtest/tests/c00019.vtc

@@ -92,5 +92,5 @@ varnish v1 -clierr 106 "ban req.url ~ [[["
 # Ban expression with quoting
 varnish v1 -cliok {ban req.url ~ "BAR"}
 shell {varnishadm -n ${tmpdir}/v1 ban 'obj.http.Host ~ \"Foo\"'}
-varnish v1 -cliok "ban.list"
+varnish v1 -cliexpect {(?s)\d+\.\d+\s+\d+\s+-\s+\Qobj.http.Host ~ "Foo"\E} "ban.list"
 varnish v1 -clijson "ban.list -j"