gdiplus/tests: initialize buffer in test_GdipCreateBitmapFromHBITMAP

[Dan Kegel]

Fixes the warning

Conditional jump or move depends on uninitialised value(s)
   at _XPutPixel1 (ImUtil.c:819)
   by X11DRV_SetBitmapBits (bitmap.c:370)
   by X11DRV_CreateBitmap (bitmap.c:186)
   by BITMAP_SetOwnerDC (bitmap.c:548)
   by BITMAP_SelectObject (bitmap.c:595)
   by SelectObject (gdiobj.c:1054)
   by GdipCreateBitmapFromHBITMAP (image.c:2844)
   by test_GdipCreateBitmapFromHBITMAP (image.c:535)
   by func_image (image.c:1647)
   by run_test (test.h:535)
   by main (test.h:585)
 Uninitialised value was created by a stack allocation
   at test_GdipCreateBitmapFromHBITMAP (image.c:501)
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