Move [FromBody] back on base controllers, to prevent a breaking change

[bkoelman]

Follow-up of the changes in #1506 and #1503. This PR moves [FromBody] back on base controllers, to prevent a breaking change.

Effectively (all PRs combined), only [Required] is being added on non-base controllers, so that Swashbuckle makes request bodies required.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• N/A: Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.78%. Comparing base (7e864a2) to head (2dcf65d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1508   +/-   ##
=======================================
  Coverage   90.78%   90.78%           
=======================================
  Files         346      346           
  Lines       11044    11044           
  Branches     1813     1813           
=======================================
  Hits        10026    10026           
  Misses        669      669           
  Partials      349      349           

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