Fixed presetDialog pointer to be derived class as suggested
Fixed presetDialog pointer to be derived class as suggested

Signed-off-by: Brianna Major <6a62c0472e857db5994824f147beeb095c78d3a5@kitware.com>

OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz