Disable AreaField clean logic
Disable AreaField clean logic

As no clean() method was defined in AreaField, we were inherinting the
clean() logic of the parent class. However, this clean logic doesn't
work with our field, so let's disable it.

The validation of the Bounding Box data is done in the clean() method
of the form.

Signed-off-by: Thomas Petazzoni <a5d87d2bd7c424ee5cbdb4e978635bf653d5a005@free-electrons.com>

maposmatic/maposmatic,hholzgra/maposmatic,hholzgra/maposmatic,hholzgra/maposmatic,wonderchook/MapOSMatic,maposmatic/maposmatic,maposmatic/maposmatic,hholzgra/maposmatic,wonderchook/MapOSMatic,maposmatic/maposmatic,hholzgra/maposmatic