Fix chest formspec protection (#540)

Hugo Locurcio

2020-04-26 4a9ad94bf9560770c0efded0c8558c4747dc887f

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RealBadAngel <maciej.kasatkin@o2.pl> <mk@realbadangel.pl>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com> <vanessa@rainbird.(none)>
kaeza <kaeza@users.sf.net> Diego Martínez <kaeza@users.sf.net>