Replace deprecated get_api_controller() with api_controller property

[kolanos]

The @deprecated for the get_api_controller() method is causing tons of warnings to be fired off because ninja_extra is still using get_api_controller().

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.05%. Comparing base (7111645) to head (208dd51).
⚠️ Report is 8 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #343   +/-   ##
=======================================
  Coverage   97.04%   97.05%           
=======================================
  Files          71       71           
  Lines        3048     3051    +3     
=======================================
+ Hits         2958     2961    +3     
  Misses         90       90           

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[eadwinCode]

@kolanos thanks for working on this