src/module-impl.lisp (output-c-excursion): Remove redundant `~&'.

src/module-impl.lisp (output-c-excursion): Remove redundant `~&'.

There's no need to have both an explicit call to `fresh-line' and `~&'
on the front of the following `format' string.  The `fresh-line' call is
the right one to leave: otherwise the new line (if any) is started after
we've called `position-aware-stream-line', which will therefore give us
the wrong answer.