fix: revert DEFAULT_SQLLAB_LIMIT to default

[betodealmeida]

SUMMARY

Revert change introduced by mistake in #14420.

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 #15869 (543d30c) into master (d408ff8) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

❗ Current head 543d30c differs from pull request most recent head 7fff4b5. Consider uploading reports for the commit 7fff4b5 to get more accurate results

@@            Coverage Diff             @@
##           master   #15869      +/-   ##
==========================================
- Coverage   77.08%   76.94%   -0.14%     
==========================================
  Files         984      984              
  Lines       51787    51787              
  Branches     7031     7031              
==========================================
- Hits        39918    39849      -69     
- Misses      11644    11713      +69     
  Partials      225      225              

Flag	Coverage Δ
hive	?
mysql	81.53% <100.00%> (ø)
postgres	81.55% <100.00%> (ø)
presto	81.28% <100.00%> (ø)
python	81.82% <100.00%> (-0.26%)	⬇️
sqlite	81.19% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
superset/config.py	91.24% <100.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.44% <0.00%> (-17.07%)	⬇️
superset/connectors/sqla/models.py	89.71% <0.00%> (-0.24%)	⬇️
superset/utils/core.py	88.12% <0.00%> (-0.13%)	⬇️

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