Fix set_rotate for dmaker.fan.p10 (#1076)

[pooyashahidi]

A suggestion to fix rotation command for P9,P10,P11,P15,P18,...
fixes issue #1076

[rytilahti]

Thanks for the PR! LGTM, but could you please add a docstring to the method while you are at it?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 75.43%. Comparing base (ac02020) to head (c2ba250).
Report is 375 commits behind head on master.

Files	Patch %	Lines
miio/fan_miot.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1078      +/-   ##
==========================================
- Coverage   75.47%   75.43%   -0.05%     
==========================================
  Files          74       74              
  Lines        8367     8372       +5     
  Branches      741      743       +2     
==========================================
  Hits         6315     6315              
- Misses       1870     1875       +5     
  Partials      182      182              

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