[dlls/user] Fix dialog box behavior without SysMenu

[Cyril Margorin]

Hello,

The DialogBox with suppressed WS_SYSMENU style should not handle the Escape key.
Patch attached.

ChangeLog:
Cyril Margorin <comargo at gmail.com>
    Fix dialog box behavior without SysMenu.
--
Cyril Margorin
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