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BUG #15763: Avoid modifying camera when it hasn't changed.

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:15763_fix_selection_issues into master

Fixes BUG #15763. The bug was caused because different ranks in ParaView made mismatching decision about whether to the HardwareSelector needed to re-render for the selection. This bug was causing the server side camera to always be modified since it would always create and set new vtkMatrix4x4 instances whenever the cameras were synchronized between ranks. Fixed not doing that and instead using API on vtkMatrix/vtkCamera that calls Modified() only when things truly change.

Fixes 15763

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