test-status.t: test ui.slash on Windows

tests/test-status.t

@@ -330,4 +330,9 b' warning message about such pattern.'
   $ hg status -A --rev 1 1
   R 1/2/3/4/5/b.txt
 
+#if windows
+  $ hg --config ui.slash=false status -A --rev 1 1
+  R 1\2\3\4\5\b.txt
+#endif
+
   $ cd ..