Removed test that used active_cell.
Removed test that used active_cell.

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