comctl32: move up-down msg seq tests into new 'msg' test

[Felix Nawothnig]

Figured you might want a test for my listview patch - so first this.

Didn't really change anything, still passed on XP SP2.
---
  dlls/comctl32/tests/Makefile.in |    1 +
  dlls/comctl32/tests/msg.c       |  523 
+++++++++++++++++++++++++++++++++++++++
  dlls/comctl32/tests/updown.c    |  435 +--------------------------------
  3 files changed, 532 insertions(+), 427 deletions(-)
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