Prematurely creating a dialog as a sheet causes problems

Prematurely creating a dialog as a sheet and then calling
exec() on it will show a window w/o decorations. The problem is
that first telling a window to be a sheet, and then tell it to
exec, is unambigious. Because doing the latter implies application
modality (when modality is not set), which again implies not
using a sheet. Calling exec (and setting modality) will win over
window flags, so in this case, we now recreate the window as a
normal app-modal dialog.

Task: 254524
Reviewed-by: Trenton Schulz

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