winex11: Fix Ctrl+Shift+Tab translation (try2)

[André Hentschel]

Now with test. Tested on W2k and WXP.
X turns shift-tab into ISO_Left_Tab and we translate it as shift+tab and leave the function.
This patch doesnt do that if Ctrl is pressed too, so that the application gets a ctrl+shift+tab.
with this patch, bug 14248 is fixed completely.
---
  dlls/user32/tests/input.c   |    2 ++
  dlls/winex11.drv/keyboard.c |    2 +-
  2 files changed, 3 insertions(+), 1 deletions(-)


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