Fixed multinomial gradient task - reduce was adding beta instead of gradient.
Fixed multinomial gradient task - reduce was adding beta instead of gradient.

michalkurka/h2o-3,mathemage/h2o-3,h2oai/h2o-dev,madmax983/h2o-3,jangorecki/h2o-3,madmax983/h2o-3,h2oai/h2o-3,spennihana/h2o-3,mathemage/h2o-3,mathemage/h2o-3,michalkurka/h2o-3,YzPaul3/h2o-3,spennihana/h2o-3,mathemage/h2o-3,h2oai/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,spennihana/h2o-3,YzPaul3/h2o-3,YzPaul3/h2o-3,h2oai/h2o-3,spennihana/h2o-3,jangorecki/h2o-3,madmax983/h2o-3,h2oai/h2o-dev,madmax983/h2o-3,h2oai/h2o-dev,madmax983/h2o-3,jangorecki/h2o-3,h2oai/h2o-3,h2oai/h2o-3,YzPaul3/h2o-3,madmax983/h2o-3,h2oai/h2o-dev,h2oai/h2o-dev,mathemage/h2o-3,YzPaul3/h2o-3,YzPaul3/h2o-3,jangorecki/h2o-3,YzPaul3/h2o-3,mathemage/h2o-3,madmax983/h2o-3,michalkurka/h2o-3,h2oai/h2o-dev,michalkurka/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,spennihana/h2o-3,michalkurka/h2o-3,jangorecki/h2o-3,spennihana/h2o-3,jangorecki/h2o-3,spennihana/h2o-3,jangorecki/h2o-3,h2oai/h2o-dev,h2oai/h2o-3,mathemage/h2o-3