gdi32: use HandleToULong inline function to convert handle to index instead of casting (try 2)

[Daniel Lehman]

> This would need some test cases.
> 
> --
> Alexandre Julliard
> julliard at winehq.org

Try2:
- added tests
- used HandleToUlong in free_gdi_handle 
  found that test fails unless it's added there as well
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