Add missing override

Cédric Traizetrequested to merge
ctraizet/temporalgapfilling:master into master

Add a missing override in otbTemporalGapFilling.h

this will remove some warnings from OTB CI, as this remote module is tested.

and some modernization of the BinaryFunctorImageFilterWithNBands class.

Edited by Cédric Traizet

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