Fix atomicfu not being resolved

[gumil]

There was this error when using Kaskade into a multiplatform project:
e: Could not find "atomicfu-cinterop-interop"

Apparently this was caused by a wrong configuration in source sets.
Test was passing but the library built didn't have the dependencies.

[codecov-commenter]

Codecov Report

Merging #59 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #59   +/-   ##
=========================================
  Coverage     96.45%   96.45%           
  Complexity       93       93           
=========================================
  Files            26       26           
  Lines           734      734           
  Branches         11       11           
=========================================
  Hits            708      708           
  Misses           19       19           
  Partials          7        7           

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