comctl32/tab: return default tab width in TCM_SETMINTABWIDTH if lParam is a negative value.

[Aric Stewart]

also in the tests use the system reported default min tab width for the 
default tab width to avoid false errors on systems with different 
default min tab width such as Japanese windows 2000.
---
  dlls/comctl32/tab.c       |    5 ++++-
  dlls/comctl32/tests/tab.c |    8 ++++----
  2 files changed, 8 insertions(+), 5 deletions(-)


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