Support the `!"` history disabling sequence

[danielshahaf]

From zshexpn(1):

If the shell encounters the character sequence tt(!")
in the input, the history mechanism is temporarily disabled until
the current list (see
ifzman(zmanref(zshmisc))
ifnzman(noderef(Shell Grammar))
) is fully parsed. The tt(!") is removed from the input, and any
subsequent tt(!) characters have no special significance.

Unfortunately, ${(z)} doesn't recognize that sequence. ☹