Fix backwards HTTP Server header test.
Fix backwards HTTP Server header test.

This was treating every unknown header as a Server header.
Good thing this was last!
The only damage was that we might have enabled pipelining even on
 known-bad servers.

youfearm3/opusfile,gcp/opusfile,youfearm3/opusfile,xiph/opusfile,SmartWalkieOrg/opusfile,SmartWalkieOrg/opusfile,SmartWalkieOrg/opusfile,xiph/opusfile,xiph/opusfile,gcp/opusfile,gcp/opusfile