Trackbar thumb initialization

[Duane Clark]

Fixes VirtualDub thumb size.
The CalcChannel call can be removed, since InitializeThumb already calls it.

Changelog:
	Reinitialize thumb when trackbar size is changed.
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Index: dlls/comctl32/trackbar.c
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RCS file: /home/wine/wine/dlls/comctl32/trackbar.c,v
retrieving revision 1.57
diff -u -r1.57 trackbar.c
--- dlls/comctl32/trackbar.c	18 Nov 2003 19:39:40 -0000	1.57
+++ dlls/comctl32/trackbar.c	25 Dec 2003 01:20:20 -0000
@@ -1503,7 +1503,7 @@
 static LRESULT
 TRACKBAR_Size (TRACKBAR_INFO *infoPtr, DWORD fwSizeType, INT nWidth, INT nHeight)
 {
-    TRACKBAR_CalcChannel (infoPtr);
+    TRACKBAR_InitializeThumb (infoPtr);
     TRACKBAR_AlignBuddies (infoPtr);
 
     return 0;