persistent-nodemap: disable it for test-wireproto-content-redirects.t

This is not relevant for the test and this will avoid a lot of variations.

Differential Revision: https://phab.mercurial-scm.org/D10338

tests/test-wireproto-content-redirects.t

@@ -1,6 +1,10 b''
   $ . $TESTDIR/wireprotohelpers.sh
 
+persistent-nodemap is not enabled by default. It is not relevant for this test so disable it.
+
   $ cat >> $HGRCPATH << EOF
+  > [format]
+  > use-persistent-nodemap = no
   > [extensions]
   > blackbox =
   > [blackbox]