drop incorrect parameter implicitely converted to bool

drop incorrect parameter implicitely converted to bool

The helper expects to be told if it should generate messages, not where
these messages should be printed – as it isn't printing such messages,
but puts them in _error. apt-get uses in other methods a helper
specialisation which does also print stuff to a stream through, so this
is likely a copy&paste error.

Git-Dch: Ignore