get rid of teco_qreg_vtable_t::undo_set_integer()master-fmsbw-ci

It was never required as a separate callback/method,
but was kept merely for consistency.
Since we now call teco_current_doc_set_dot() in
teco_qreg_dot_set_integer(), we'd have to split it up into
an "undo" method as well. I decided to get rid of the
superfluous Q-Reg method instead.

It's quite likely we could get rid of the remaining
undo_set_string(), undo_exchange_string() and undo_edit()
callbacks as well (TODO).

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