hst: remove enablement json adapter

The go116 behaviour of built-in new function makes this cleaner.

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

internal/system/system_test.go

@@ -20,7 +20,7 @@ func TestCriteria(t *testing.T) {
 
 	testCases := []struct {
 		name  string
-		ec, t hst.Enablement
+		ec, t hst.Enablements
 		want  bool
 	}{
 		{"nil", 0xff, hst.EWayland, true},
@@ -47,7 +47,7 @@ func TestTypeString(t *testing.T) {
 	t.Parallel()
 
 	testCases := []struct {
-		e    hst.Enablement
+		e    hst.Enablements
 		want string
 	}{
 		{hst.EWayland, hst.EWayland.String()},
@@ -190,7 +190,7 @@ func TestCommitRevert(t *testing.T) {
 	testCases := []struct {
 		name string
 		f    func(sys *I)
-		ec   hst.Enablement
+		ec   hst.Enablements
 
 		commit        []stub.Call
 		wantErrCommit error