dlls/user/button.c - fix AUTO3STATE with BS_OWNERDRAW

[Michael Lin]

AUTO3STATE control with BS_OWNERDRAW set will not get created.

ChangeLog:
* fix AUTO3STATE with BS_OWNERDRAW set

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Index: dlls/user/button.c
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RCS file: /home/wine/wine/dlls/user/button.c,v
retrieving revision 1.6
diff -r1.6 button.c
183c183,186
<     return (window_style & 0x0f);
---
>     if ((window_style & BS_OWNERDRAW) == BS_OWNERDRAW)
>         return BS_OWNERDRAW;
>     else
>         return (window_style & 0x0f);