fix: update db for expose in sqllab param

[hughhhh]

SUMMARY

Properly passing the default value of sqlllab params from the api

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• 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 #15609 (2450142) into master (2be52c0) will decrease coverage by 0.14%.
The diff coverage is 100.00%.

❗ Current head 2450142 differs from pull request most recent head 301ce86. Consider uploading reports for the commit 301ce86 to get more accurate results

@@            Coverage Diff             @@
##           master   #15609      +/-   ##
==========================================
- Coverage   76.88%   76.73%   -0.15%     
==========================================
  Files         976      976              
  Lines       51320    51321       +1     
  Branches     6907     6907              
==========================================
- Hits        39458    39382      -76     
- Misses      11643    11720      +77     
  Partials      219      219              

Flag	Coverage Δ
hive	?
mysql	81.56% <100.00%> (+<0.01%)	⬆️
postgres	81.58% <100.00%> (+<0.01%)	⬆️
python	81.67% <100.00%> (-0.29%)	⬇️
sqlite	81.19% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset/databases/api.py	92.95% <100.00%> (+0.02%)	⬆️
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.44% <0.00%> (-17.07%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/db_engine_specs/presto.py	83.36% <0.00%> (-1.06%)	⬇️
superset/db_engine_specs/base.py	88.14% <0.00%> (-0.40%)	⬇️
superset/connectors/sqla/models.py	88.26% <0.00%> (-0.24%)	⬇️
superset/utils/core.py	88.97% <0.00%> (-0.13%)	⬇️

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[rosemarie-chiu]

🏷 2021.27