Fix the first bucket not getting chunked properly. The reason was that

we left the TE header in the output headers, so ap_set_keepalive didn't
set r->chunked to 1.  So, ap_http_header_filter wouldn't insert CHUNK
filter appropriately.  I have no clue how it chunked anything at all
before this patch, but hey, it looks right now.

Tested with Yahoo, Apple, apache.org, and /.
/. is interesting in that it sends both Conn: Close and TE: chunked.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91463 13f79535-47bb-0310-9956-ffa450edef68