[v0.16.0] Fix ApiServerAggregatorKeyPath unnamed flag

[jorge07]

Fixes #1849

[k8s-ci-robot]

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[codecov-io]

Codecov Report

Merging #1850 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1850   +/-   ##
=======================================
  Coverage   24.40%   24.40%           
=======================================
  Files          98       98           
  Lines        5117     5117           
=======================================
  Hits         1249     1249           
  Misses       3728     3728           
  Partials      140      140           

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[dominicgunn]

/lgtm