Fix assign to support multi-index columns.

[ueshin]

No description provided.

[softagram-bot]

Softagram Impact Report for pull/811 (head commit: c43cb93)

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[codecov-io]

Codecov Report

Merging #811 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #811      +/-   ##
==========================================
+ Coverage   94.32%   94.35%   +0.02%     
==========================================
  Files          32       32              
  Lines        5832     5844      +12     
==========================================
+ Hits         5501     5514      +13     
+ Misses        331      330       -1

Impacted Files	Coverage Δ
databricks/koalas/frame.py	96.89% <100%> (+0.09%)	⬆️

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[HyukjinKwon]

Haven't taken a look closely but looks fine in general

[ueshin]

Thanks! merging.