Fix long line: Workaround for request header values with trailing '\r' or '\r\n'

Commit 8ef2dacc introduced a long line
(101 characters) that broke the checkstyle pass of okhttp's internal
tests run via "mvn clean verify".

This CL wraps the line.

Test: mvn clean verify

Change-Id: I0074cb35908589d984b77f66bb11d02d414b42c8