Fixed test for equiv pot temp
Fixed test for equiv pot temp

jrleeman/MetPy,jrleeman/MetPy,ahaberlie/MetPy,Unidata/MetPy,Unidata/MetPy,dopplershift/MetPy,ahaberlie/MetPy,ahill818/MetPy,ShawnMurd/MetPy,dopplershift/MetPy,deeplycloudy/MetPy