vtkGLSLModCamera: initialize boolean members
POD types do not get explicitly initialized and can be junk values. This
triggers UBSan when the value is a bool and the value is not 0 or 1.
Cc: @seanm
POD types do not get explicitly initialized and can be junk values. This
triggers UBSan when the value is a bool and the value is not 0 or 1.
Cc: @seanm