hst/config: remove seccomp bit fields

These serve little purpose and are not friendly for use from other languages.

Signed-off-by: Ophestra <cat@gensokyo.uk>

hst/hst_test.go

@@ -166,8 +166,6 @@ func TestTemplate(t *testing.T) {
 	"container": {
 		"hostname": "localhost",
 		"wait_delay": -1,
-		"seccomp_flags": 1,
-		"seccomp_presets": 1,
 		"seccomp_compat": true,
 		"devel": true,
 		"userns": true,