Trackbar: Window Class Fix

[Robert Shearman]

Note: COLOR_BTNFACE is the same value as COLOR_3DFACE, but COLOR_BTNFACE 
is the recommended value to use.

Changelog:
Set hbrBackground class property to same value as native.
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Index: wine/dlls/comctl32/trackbar.c
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RCS file: /home/wine/wine/dlls/comctl32/trackbar.c,v
retrieving revision 1.61
diff -u -p -r1.61 trackbar.c
--- wine/dlls/comctl32/trackbar.c	2 Sep 2004 23:00:53 -0000	1.61
+++ wine/dlls/comctl32/trackbar.c	13 Sep 2004 20:26:06 -0000
@@ -1816,11 +1816,11 @@ void TRACKBAR_Register (void)
 
     ZeroMemory (&wndClass, sizeof(WNDCLASSW));
     wndClass.style         = CS_GLOBALCLASS;
-    wndClass.lpfnWndProc   = (WNDPROC)TRACKBAR_WindowProc;
+    wndClass.lpfnWndProc   = TRACKBAR_WindowProc;
     wndClass.cbClsExtra    = 0;
     wndClass.cbWndExtra    = sizeof(TRACKBAR_INFO *);
     wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_ARROW);
-    wndClass.hbrBackground = (HBRUSH)(COLOR_3DFACE + 1);
+    wndClass.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
     wndClass.lpszClassName = TRACKBAR_CLASSW;
 
     RegisterClassW (&wndClass);