If I end up with `(])` in the field I can't delete any paren at all

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I don't know how my younger brother ended up with (]) in the field but as it's there he can't delete anything using backspace on mobile phone. So he has to cut or reload the page. This is related to https://github.com/oxalorg/4ever-clojure/issues/64 because it's the same buggy paren deletion prevention.

This is the reason why I don't use plugins like parinfer and other auto paren balancers. They do their job but then they interfere very much.