bug fix for ImmediateModeRendering

[Randy Heiland]

My earlier bug report for ImmediateModeRendering can be fixed by the following,
in graphics/vtkOpenGLPolyDataMapper.cxx:

after:
  // if we are in immediate mode rendering we always
  // want to draw the primitives here
  if (this->ImmediateModeRendering ||
      this->GetGlobalImmediateModeRendering())
    {
insert:
    this->GetColors();


I've no idea if this is the best fix, but it solves my immediate problem - no
pun intended :)

I'm still confused over this relationship between vtkScalars and
vtkLookupTable, and the fact that a LUT also has a copy of the ScalarRange (I
sent in a question earlier, but the list was down)...

--Randy
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