CLN: ASV panel ctor

[mroeschke]

There were two benchmarks that were essentially the same (dictionary of dataframes with the same index benchmark), so I removed one along with the usual flake8.

$ asv dev -b ^panel_ctor
· Discovering benchmarks
· Running 3 total benchmarks (1 commits * 1 environments * 3 benchmarks)
[  0.00%] ·· Building for existing-py_home_matt_anaconda_envs_pandas_dev_bin_python
[  0.00%] ·· Benchmarking existing-py_home_matt_anaconda_envs_pandas_dev_bin_python
[ 33.33%] ··· Running panel_ctor.DifferentIndexes.time_from_dict          387ms
[ 66.67%] ··· Running panel_ctor.SameIndexes.time_from_dict              32.0ms
[100.00%] ··· Running panel_ctor.TwoIndexes.time_from_dict                105ms

[codecov]

Codecov Report

Merging #18915 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18915      +/-   ##
==========================================
+ Coverage   91.65%   91.67%   +0.02%     
==========================================
  Files         154      154              
  Lines       51368    51368              
==========================================
+ Hits        47080    47092      +12     
+ Misses       4288     4276      -12

Flag	Coverage Δ
#multiple	89.54% <ø> (+0.02%)	⬆️
#single	40.84% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/plotting/_converter.py	66.95% <0%> (+1.73%)	⬆️

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[jreback]

thanks!