DeleteChannels : Fixed hashChannelNames() method.
DeleteChannels : Fixed hashChannelNames() method.

It was calling the wrong base class method prior to adding its own hashing.

ivanimanishi/gaffer,ImageEngine/gaffer,hradec/gaffer,lucienfostier/gaffer,chippey/gaffer,hradec/gaffer,goddardl/gaffer,chippey/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,boberfly/gaffer,appleseedhq/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,goddardl/gaffer,lucienfostier/gaffer,boberfly/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,ivanimanishi/gaffer,hradec/gaffer,ImageEngine/gaffer,appleseedhq/gaffer,chippey/gaffer,andrewkaufman/gaffer,goddardl/gaffer,boberfly/gaffer,johnhaddon/gaffer,goddardl/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,hradec/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,boberfly/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,chippey/gaffer,hradec/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer