Changed MCHITTESTINFO.cbSize to fall back to V1:
  From the rest of the tests, it looks like the extended size
  of MCHITTESTINFO requires loading common controls V6, which is
  only done afterwards in the tests.

Improved lookup of an unselected day.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50097Signed-off-by: Eric Pouech <eric.pouech@gmail.com>