Removing incorrect dimensionless_angles bugfix
Removing incorrect dimensionless_angles bugfix

In the previous commit, I stated that the dimensionless_angles
equivalency should not be used.  However, for cases like a velocity
divided by an angular frequency, it is perfectly appropriate to use
that equivalency, so I am putting this back to the way it was.
Radians are still weird.

StanczakDominik/PlasmaPy