refactor(filterset): improve response body

[ofekisr]

1. I was asked to add id into the response
2. it is no sense to send back the client the object has just sent, better to return the new created/updated object

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #16974 (4cfa594) into master (9a8911f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #16974   +/-   ##
=======================================
  Coverage   76.85%   76.85%           
=======================================
  Files        1030     1030           
  Lines       55017    55017           
  Branches     7464     7464           
=======================================
  Hits        42282    42282           
  Misses      12482    12482           
  Partials      253      253           

Flag	Coverage Δ
hive	81.44% <100.00%> (ø)
mysql	81.83% <100.00%> (ø)
postgres	81.89% <100.00%> (ø)
python	82.24% <100.00%> (ø)
sqlite	81.51% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/dashboards/filter_sets/api.py	97.14% <100.00%> (ø)

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[amitmiran137]

LGTM!