qa: fix test 178 to not quote some symbols unnecessarily
qa: fix test 178 to not quote some symbols unnecessarily

This was causing very recent versions of gawk(1) to produce:
"warning: regexp escape sequence `\<' is not a known regexp operator"
(first observed on the gawk version in Fedora 31)

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp