fix(api): correctly name types paramters of /posts.json

[Psycojoker]

The types parameters for queries on /posts.json was not taken into account because it was badly named.

Related Clickup or Jira tickets : ALEPH-301

Self proofreading checklist

• Is my code clear enough and well documented
• Are my files well typed
• New translations have been added or updated if new strings have been introduced in the frontend
• Database migrations file are included
• Are there enough tests
• Documentation has been included (for new feature)

Changes

Just correctly name it.

How to test

Simply do a query on posts.json with the types[]=... query parameters like so:

curl 'http://localhost:4024/api/v0/posts.json?types[]=corechan-operation' | python -m json.tool | grep '"type":'

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