[vtkusers] Small bug in StartPick method

[william shuckley]

Hello,

I believe the StartPick() method needs to have a MakeCurrent() call before 
it starts making openGL calls.  This causes problems when I am interacting 
with multiple VTK windows.  When I add the MakeCurrent() at the beginning of 
this function there is no problem.  Please let me know if my assumption is 
incorrect.

-Tony

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