test-revset: fix test vector for ordering issue of matching()

592e0beee8b0 fixed matching() to preserve the order of the input set, but
the test was incorrect. Given "A and B", "A" should be the input set to "B".
But thanks to our optimizer, the test expression was rewritten as
"(2 or 3 or 1) and matching(1 or 2 or 3)", therefore it was working well.

Since I'm going to fix the overall ordering issue, the test needs to be
adjusted to do the right thing.

tests/test-revset.t

@@ -1566,7 +1566,10 b' we can use patterns when searching for t'
   0
   $ log '4::8 - 8'
   4
-  $ log 'matching(1 or 2 or 3) and (2 or 3 or 1)'
+
+matching() should preserve the order of the input set:
+
+  $ log '(2 or 3 or 1) and matching(1 or 2 or 3)'
   2
   3
   1