tests: stabilize test-shelve.t#phasebased for #no-symlink and #no-execbit

The rev number ended up being 11 instead of 13 on Windows.  If I ever get back
to issue2020, this will go away.

tests/test-shelve.t

@@ -532,6 +532,15 b' ensure that metadata-only changes are sh'
   M a/a
   $ hg revert a/a
 
+#else
+
+Dummy shelve op, to keep rev numbers aligned
+
+  $ echo foo > a/a
+  $ hg shelve -q -n dummy a/a
+  $ hg unshelve -q dummy
+  $ hg revert a/a
+
 #endif
 
 #if symlink
@@ -545,6 +554,15 b' ensure that metadata-only changes are sh'
   M a/a
   $ hg revert a/a
 
+#else
+
+Dummy shelve op, to keep rev numbers aligned
+
+  $ echo bar > a/a
+  $ hg shelve -q -n dummy a/a
+  $ hg unshelve -q dummy
+  $ hg revert a/a
+
 #endif
 
 set up another conflict between a commit and a shelved change