compat: normalise path before comparison in revlog splitting test

This fixes the test on Window.

Differential Revision: https://phab.mercurial-scm.org/D10999

tests/test-transaction-rollback-on-revlog-split.t

@@ -10,14 +10,13 b' Helper extension to intercept renames.'
   > 
   > def extsetup(ui):
   >     def close(orig, *args, **kwargs):
-  >         path = args[0]._atomictempfile__name
+  >         path = util.normpath(args[0]._atomictempfile__name)
   >         if path.endswith(b'/.hg/store/data/file.i'):
   >             os._exit(80)
   >         return orig(*args, **kwargs)
   >     extensions.wrapfunction(util.atomictempfile, 'close', close)
   > EOF
 
-
 Test offset computation to correctly factor in the index entries themselve.
 Also test that the new data size has the correct size if the transaction is aborted
 after the index has been replaced.