chore(jest): Fix jest config path

[dominique-mueller]

• Revert jest config path (by defining the rootDir property, see ts-jest is not installed properly thymikee/jest-preset-angular#59)

[codecov]

Codecov Report

Merging #34 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop      #34   +/-   ##
========================================
  Coverage    99.01%   99.01%           
========================================
  Files           14       14           
  Lines          408      408           
  Branches        65       65           
========================================
  Hits           404      404           
  Misses           4        4

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