transform/livereloadinject: Don't use document.write to inject livereload

I suspect the person who originally implemented it saw examples using location.host etc. to build the URL.

We have all that information ready at build (static) time.

Fixes #6507

transform/livereloadinject/livereloadinject.go

@@ -59,7 +59,7 @@ func New(port int) transform.Transformer {
 			return err
 		}
 
-		script := []byte(fmt.Sprintf(`<script data-no-instant>document.write('<script src="/livereload.js?port=%d&mindelay=10&v=2"></' + 'script>')</script>`, port))
+		script := []byte(fmt.Sprintf(`<script src="/livereload.js?port=%d&mindelay=10&v=2" data-no-instant></script>`, port))
 
 		i := idx
 		if match.appendScript {

transform/livereloadinject/livereloadinject_test.go

@@ -25,7 +25,7 @@ import (
 func TestLiveReloadInject(t *testing.T) {
 	c := qt.New(t)
 
-	expectBase := `<script data-no-instant>document.write('<script src="/livereload.js?port=1313&mindelay=10&v=2"></' + 'script>')</script>`
+	expectBase := `<script src="/livereload.js?port=1313&mindelay=10&v=2" data-no-instant></script>`
 	apply := func(s string) string {
 		out := new(bytes.Buffer)
 		in := strings.NewReader(s)