[vtkusers] bug / fix in vtkXYPlotActor.cxx

[Olivier Cuisenaire]

I think I found a small bug in vtkXYPlotActor. It doesn't display the 
range of the Y axis correctly in some cases. The following patch solves 
the problem.

Olivier

-- 
Olivier Cuisenaire, Ph.D.              Phone:+41 21 6934712
http://ltswww.epfl.ch/~cuisenai 
        Fax:  +41 21 6937600	
Signal Processing Laboratory (LTS), Swiss Federal Institute
of Technology (EPFL), CH-1015 Lausanne, Switzerland

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