remove not working code for checking writable files ("is_writable()" uses a different user)
remove not working code for checking writable files ("is_writable()" uses a different user)

fabrixxm/friendica,tobiasd/friendica,tobiasd/friendica,tobiasd/friendica,annando/friendica,friendica/friendica,friendica/friendica,tobiasd/friendica,fabrixxm/friendica,fabrixxm/friendica,annando/friendica,fabrixxm/friendica,friendica/friendica,annando/friendica,annando/friendica,annando/friendica,friendica/friendica,friendica/friendica,fabrixxm/friendica,tobiasd/friendica