Remove super verbose logging.debug call

[mistercrunch]

I left this behind on a previous PR, and it gets kind of crazy on large
SQL statements, so decided it's probably a good thing to clean this up.

[codecov-io]

Codecov Report

Merging #7122 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7122      +/-   ##
==========================================
- Coverage   64.61%   64.61%   -0.01%     
==========================================
  Files         422      422              
  Lines       20600    20606       +6     
  Branches     2253     2253              
==========================================
+ Hits        13311    13314       +3     
- Misses       7167     7170       +3     
  Partials      122      122

Impacted Files	Coverage Δ
superset/sql_parse.py	99.13% <ø> (-0.01%)	⬇️
superset/connectors/druid/models.py	82.51% <0%> (-0.23%)	⬇️
superset/connectors/druid/views.py	66.21% <0%> (ø)	⬆️

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