Cleaned up logic to change chart selection mode.
Cleaned up logic to change chart selection mode.

The selection action of mouse buttons should not be changed when modifying
the chart selection mode. There should be separate logic at application
level to control the selection actions vs selection modes. This change is
also part of the change in Paraview's chart selection actions.

Change-Id: I38a7d7312cf0026c3fd8a5f4a3631d446df678e6

sumedhasingla/VTK,mspark93/VTK,msmolens/VTK,SimVascular/VTK,biddisco/VTK,ashray/VTK-EVM,berendkleinhaneveld/VTK,demarle/VTK,keithroe/vtkoptix,sumedhasingla/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,collects/VTK,SimVascular/VTK,ashray/VTK-EVM,candy7393/VTK,collects/VTK,SimVascular/VTK,sankhesh/VTK,biddisco/VTK,keithroe/vtkoptix,ashray/VTK-EVM,aashish24/VTK-old,johnkit/vtk-dev,collects/VTK,ashray/VTK-EVM,sankhesh/VTK,johnkit/vtk-dev,hendradarwin/VTK,msmolens/VTK,johnkit/vtk-dev,demarle/VTK,SimVascular/VTK,msmolens/VTK,biddisco/VTK,demarle/VTK,jmerkow/VTK,johnkit/vtk-dev,johnkit/vtk-dev,biddisco/VTK,msmolens/VTK,hendradarwin/VTK,aashish24/VTK-old,mspark93/VTK,ashray/VTK-EVM,aashish24/VTK-old,msmolens/VTK,sumedhasingla/VTK,hendradarwin/VTK,sankhesh/VTK,gram526/VTK,mspark93/VTK,SimVascular/VTK,sumedhasingla/VTK,mspark93/VTK,ashray/VTK-EVM,ashray/VTK-EVM,gram526/VTK,johnkit/vtk-dev,mspark93/VTK,msmolens/VTK,demarle/VTK,keithroe/vtkoptix,gram526/VTK,msmolens/VTK,mspark93/VTK,candy7393/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,biddisco/VTK,candy7393/VTK,johnkit/vtk-dev,candy7393/VTK,jmerkow/VTK,hendradarwin/VTK,mspark93/VTK,msmolens/VTK,candy7393/VTK,gram526/VTK,hendradarwin/VTK,aashish24/VTK-old,SimVascular/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,candy7393/VTK,hendradarwin/VTK,gram526/VTK,demarle/VTK,SimVascular/VTK,sankhesh/VTK,gram526/VTK,sankhesh/VTK,SimVascular/VTK,biddisco/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,collects/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,jmerkow/VTK,demarle/VTK,keithroe/vtkoptix,keithroe/vtkoptix,candy7393/VTK,jmerkow/VTK,candy7393/VTK,jmerkow/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,gram526/VTK,sankhesh/VTK,mspark93/VTK,gram526/VTK,keithroe/vtkoptix,ashray/VTK-EVM,sumedhasingla/VTK,collects/VTK,sankhesh/VTK,jmerkow/VTK,keithroe/vtkoptix,biddisco/VTK,collects/VTK,jmerkow/VTK,demarle/VTK,hendradarwin/VTK,demarle/VTK,jmerkow/VTK