[theme][tests] fix babel-jest path

[williaster]

🏠 Internal
Not sure how this passed through the cracks and passed previously, but this fixes the babel-jest path for the theme package

[codecov]

Codecov Report

Merging #148 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   80.53%   80.53%           
=======================================
  Files         109      109           
  Lines        2415     2415           
  Branches      568      568           
=======================================
  Hits         1945     1945           
  Misses        290      290           
  Partials      180      180

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