Fix "reorder" warning about Scroll member.
Fix "reorder" warning about Scroll member.

The vtkWebInteractionEvent constructor was initializing its members
in a different order than the one in which they had been declared.
This caused a warning with gcc's "-Wreorder" option.

Change-Id: Iac50713f0fabd8610b9c5cc47a92fa170a917bdb

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