Ignore inactive sources

[maudetes]

active field wasn't actually used to deactivate a source.
This field was misleading and not doing anything.

Actual sources that are marked inactive (but not actually deactivated):

>>> from udata.harvest.models import HarvestSource
>>> for source in HarvestSource.objects(validation__state='accepted', active=False):
...     print(source.id, source.get_last_job().status)
... 
66713b4a2063a18d4f2c77c0 done
666854d2ae020ef75f404615 done
66632580d7365f18b2c81902 done-errors
6451227e111449ae4bff5531 done-errors
641477c66237d10651e97010 done
63dd6eec5f9e9f5cf63bd631 done
633c4314a184a25b2e68b5dd done
632094a92d19bc6c4b86a351 done
62bef8cc760c4fa031fef6ae failed
621e20edf3eeb9b91b4c385c done
61c473775299bbb5dc7af685 done
619fa44bc8e802460bca2faa done
617930065fe883dc16fd36a8 done
60ba37a6657399492704cf0a done-errors
609b98f009c75b3309329255 done-errors
607e9fcbc43657eaf1b0ad93 failed
605b3b19a97b6edbad874083 done
6017a714d475bada80963806 failed
6013cb4c2eb0904b6ab34f77 failed
6013ca70c5aa11960b3e48e1 failed
600fe3a8f921a2ce63619484 done
5fa985cc221828792d64fc3b done
5f89b201fb6b903f47f98892 done
5b45c89c88ee381dc9c83574 done

We should set active=True and we may want to contact them to inform them of their active harvesters.
➡️ Updated sources with active=True in production, except for the trouver.datasud.fr failing harvest sources.

[magopian]

That was a hard one to review ;)
Good job!
🚢