Removed second definition of status_at_node setter.
Removed second definition of status_at_node setter.

laijingtao/landlab,cmshobe/landlab,amandersillinois/landlab,landlab/landlab,csherwood-usgs/landlab,ManuSchmi88/landlab,cmshobe/landlab,Carralex/landlab,ManuSchmi88/landlab,RondaStrauch/landlab,Carralex/landlab,RondaStrauch/landlab,SiccarPoint/landlab,laijingtao/landlab,amandersillinois/landlab,RondaStrauch/landlab,Carralex/landlab,landlab/landlab,SiccarPoint/landlab,ManuSchmi88/landlab,cmshobe/landlab,landlab/landlab,csherwood-usgs/landlab