ListView fixes for Diamond (Try 2)

[Filip Navara]

Changelog:
- Don't update infoPtr->dwStyle in LISTVIEW_WindowProc. It's already
  handled in LISTVIEW_StyleChanged and LISTVIEW_Create processing.
- Ignore WS_VSCROLL/WS_HSCROLL flags in infoPtr->dwStyle because it's
  not always up-to-date.
- Fix TOOLBAR_DrawMasked to correctly use image list mask.

- Filip
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