py3: add b'' prefixes in tests/test-hgweb-non-interactive.t

# skip-blame because just b'' prefix

Differential Revision: https://phab.mercurial-scm.org/D4609

tests/test-hgweb-non-interactive.t

@@ -65,7 +65,7 b' by the WSGI standard and strictly implem'
   >     'SERVER_PROTOCOL': 'HTTP/1.0'
   > }
   > 
-  > i = hgweb('.')
+  > i = hgweb(b'.')
   > for c in i(env, startrsp):
   >     pass
   > print('---- ERRORS')
@@ -74,7 +74,7 b' by the WSGI standard and strictly implem'
   > print(sorted([x for x in os.environ if x.startswith('wsgi')]))
   > print('---- request.ENVIRON wsgi variables')
   > with i._obtainrepo() as repo:
-  >     print(sorted([x for x in repo.ui.environ if x.startswith('wsgi')]))
+  >     print(sorted([x for x in repo.ui.environ if x.startswith(b'wsgi')]))
   > EOF
   $ $PYTHON request.py
   ---- STATUS