Fix filter for multi-index columns support.

[ueshin]

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Softagram Impact Report for pull/859 (head commit: ef04871)

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[codecov-io]

Codecov Report

Merging #859 into master will decrease coverage by 1.57%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #859      +/-   ##
==========================================
- Coverage   94.22%   92.65%   -1.58%     
==========================================
  Files          34       34              
  Lines        6150     6150              
==========================================
- Hits         5795     5698      -97     
- Misses        355      452      +97

Impacted Files	Coverage Δ
databricks/koalas/internal.py	95.87% <100%> (ø)	⬆️
databricks/koalas/frame.py	96.09% <100%> (ø)	⬆️
databricks/koalas/usage_logging/__init__.py	24.54% <0%> (-72.73%)	⬇️
databricks/koalas/usage_logging/usage_logger.py	50% <0%> (-50%)	⬇️
databricks/koalas/__init__.py	77.5% <0%> (-7.5%)	⬇️
databricks/conftest.py	93.02% <0%> (-4.66%)	⬇️

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