test-permission: put sane permissions at the end of the test

If we don't do that, we won't delete all directories at the end of the test

tests/test-permissions

@@ -1,25 +1,27
 #!/bin/sh
 
 hg init t
 cd t
 echo foo > a
 hg add a
 hg commit -m "1" -d "1000000 0"
 hg verify
 chmod -r .hg/store/data/a.i
 hg verify 2>/dev/null || echo verify failed
 chmod +r .hg/store/data/a.i
 hg verify 2>/dev/null || echo verify failed
 chmod -w .hg/store/data/a.i
 echo barber > a
 hg commit -m "2" -d "1000000 0" 2>/dev/null || echo commit failed
 chmod -w .
 hg diff --nodates
 chmod +w .
 
 chmod +w .hg/store/data/a.i
 mkdir dir
 touch dir/a
 hg status
 chmod -rx dir
 hg status
+# reenable perm to allow deletion
+chmod +rx dir