progman: add close button and sysmenu to dialogs

[Mikołaj Zalewski]

  This patch adds the WS_POPUP | WS_CAPTION | WS_SYSMENU styles to 
progman dialogs. In the managed mode the close button was shown even 
without these styles but seemed not to work. In the unmanaged mode it's 
also nice to have the close button.

Changelog: add close button and sysmenu to dialogs
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