user32: Ensure that WM_INITDIALOG passes the first tabstop control handle to the dialog procedure.

[Andrew Nguyen]

The wParam value of the WM_INITDIALOG message is supposed to be the
handle to the first tabstop control in the dialog. This fixes bug
21820.

---
 dlls/user32/dialog.c       |    9 ++++++---
 dlls/user32/tests/dialog.c |   18 ++++++++++++++++++
 2 files changed, 24 insertions(+), 3 deletions(-)
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