Add revue to the permitted groups for the contact form

[falbru]

Initially, I wanted to add support for only contacting the revue board. However, the only way to achieve that would be to hardcode in the group id (or handle RevyStyret as a special group like we do Hovedstyret). I decided to just add support for all revue groups, because that was a lot easier.

Related to this PR.

[danielyanghansen]

I actually think it's quite nice to allow all of the revue groups to be contacted. The subgroups have leaders anyway, and groups like the band can deffo be relevant to contact (if they want to be available)

anyways: Looks good

[jonasdeluna]

LGTM, is there a frontend change adding the revue to the group picker or is that automatic?

[falbru]

LGTM, is there a frontend change adding the revue to the group picker or is that automatic?

Yup. This one.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6e6a8dc) 88.21% compared to head (c3d75cc) 88.21%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3511   +/-   ##
=======================================
  Coverage   88.21%   88.21%           
=======================================
  Files         666      666           
  Lines       21083    21084    +1     
=======================================
+ Hits        18598    18599    +1     
  Misses       2485     2485           

Files	Coverage Δ
lego/apps/contact/serializers.py	100.00% <100.00%> (ø)

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