BUG: the default web conesearch form is broken

[agy-why]

The default form for the web conesearch is broken due to a typo in the dec variable name. The DEC default value does not show off.

https://github.com/django-daiquiri/daiquiri/blob/master/daiquiri/query/templates/query/query_form_cone.html#L28C53-L28C53

Additionally the default units of search radius SR is arcsec which is not consistent with IVOA standard using degrees.
We need to decide if we want to keep it like that or switch to degrees.