Remove func used for testing earlier

No need to push new version to Cloud Run though.
And yes, I know that static/example.txt still is around. Is funny to keep

main.go

@@ -8,12 +8,6 @@ import (
 	"os"
 )
 
-func (a abc) Open(name string) (http.File, error) {
-	val, err := a.Open(name)
-	fmt.Println(err)
-	return val, err
-}
-
 func main() {
 	port := os.Getenv("PORT")
 	if port == "" {