remove extraneous about_me serializer fields

[singingwolfboy]

These fields were introduced in #1862, but they aren't actually necessary. Because these classes inherit from ModelSerializer, they automatically generate these fields, so there's no need to specify them (except in the Meta.fields list, where they're already specified).

[codecov-io]

Current coverage is 85.62% (diff: 100%)

Merging #2296 into master will decrease coverage by <.01%

@@             master      #2296   diff @@
==========================================
  Files           238        238          
  Lines         12144      12142     -2   
  Methods        1008       1008          
  Messages          0          0          
  Branches       1640       1640          
==========================================
- Hits          10399      10397     -2   
  Misses         1710       1710          
  Partials         35         35          

Powered by Codecov. Last update fb75ab9...6a6faa7

[giocalitri]

I am not sure I understood the explanation in this PR.

[singingwolfboy]

ProfileSerializer and ProfileFilledOutSerializer both inherit from ModelSerializer, which introspects a Django model class and automatically generates serializer fields based on the model fields. Because of this introspection, there's no need to declare these serializer fields manually, the way this code was doing. All that's necessary is to make sure that about_me is referenced in the fields list, and it already is listed there.

@giocalitri is that clearer?

[giocalitri]

ok, now it is clear: what I understood was that the field was defined in the base class (and I could not find it for obvious reasons)

[giocalitri]

this looks fine to me 👍