Fix vtkImageSliceRepresentation's mtime.
Fixes issue after commit 07671104. The data object now needs to be modified in RequestData() for the delivery code to detect that it was indeed updated. This was causing pvcs.Slice and pvcrs.Slice tests to fail. This fixes it. Change-Id: I2040045cd88b94b39509551cc5f30ae1a582245c
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