fix: Revert "quote column name if db requires (#15465)"

[eschutho]

This reverts commit 80b8df0.

SUMMARY

The commit above fixes cases for virtual datasets where an alias for a column was created with quotes for snowflake, but it does not work for regular datasets where the columns have not been aliased. Reverting this change for now because it is less likely to have a chart that relies on a dataset with a named, quoted aliases, than it it to be using an unquoted alias or a table.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

NA

TESTING INSTRUCTIONS

create a dataset or virtual dataset and try to create a chart from it

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 #15752 (83c48fc) into master (e9383e6) will decrease coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #15752      +/-   ##
==========================================
- Coverage   76.92%   76.69%   -0.23%     
==========================================
  Files         983      983              
  Lines       51609    51607       -2     
  Branches     6988     6988              
==========================================
- Hits        39698    39578     -120     
- Misses      11688    11806     +118     
  Partials      223      223              

Flag	Coverage Δ
hive	?
mysql	81.54% <100.00%> (-0.01%)	⬇️
postgres	81.56% <100.00%> (-0.01%)	⬇️
presto	?
python	81.65% <100.00%> (-0.45%)	⬇️
sqlite	81.18% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset/connectors/sqla/models.py	88.23% <100.00%> (-1.68%)	⬇️
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.44% <0.00%> (-17.07%)	⬇️
superset/db_engine_specs/presto.py	83.36% <0.00%> (-6.95%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/db_engine_specs/base.py	88.28% <0.00%> (-0.40%)	⬇️
superset/models/core.py	89.79% <0.00%> (-0.27%)	⬇️
superset/utils/core.py	88.12% <0.00%> (-0.13%)	⬇️

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[rosemarie-chiu]

🏷 2021.27

[rosemarie-chiu]

Verified by QA.

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After: