mod_deflate: follow up to r1619444.

Fix counting of inflated bytes in deflate_in_filter() when asked to flush, since
we now count bytes per inflate() call everywhere, we can't count all the produced
bytes there.

We still need to include all the produced bytes in the brigade.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1619483 13f79535-47bb-0310-9956-ffa450edef68