py3: fix test-newcgi.t

Differential Revision: https://phab.mercurial-scm.org/D5683

contrib/python3-whitelist

@@ -455,6 +455,7 b' test-narrow-widen.t'
 test-narrow.t
 test-nested-repo.t
 test-newbranch.t
+test-newcgi.t
 test-newercgi.t
 test-nointerrupt.t
 test-obshistory.t

tests/test-newcgi.t

@@ -18,7 +18,7 b' before d74fc8dec2b4 still work.'
   > from mercurial.hgweb.request import wsgiapplication
   > 
   > def make_web_app():
-  >     return hgweb("test", "Empty test repository")
+  >     return hgweb(b"test", b"Empty test repository")
   > 
   > wsgicgi.launch(wsgiapplication(make_web_app))
   > HGWEB
@@ -44,7 +44,7 b' before d74fc8dec2b4 still work.'
   > from mercurial.hgweb.request import wsgiapplication
   > 
   > def make_web_app():
-  >     return hgwebdir("hgweb.config")
+  >     return hgwebdir(b"hgweb.config")
   > 
   > wsgicgi.launch(wsgiapplication(make_web_app))
   > HGWEBDIR