fix(jest-phabricator): use default export

[SimenB]

Summary

Bundling doesn't like export = , so one more removal

Test plan

Green CI

[codecov-commenter]

Codecov Report

Merging #12341 (ecdd2d9) into main (5f1d31c) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main   #12341   +/-   ##
=======================================
  Coverage   66.97%   66.97%           
=======================================
  Files         330      330           
  Lines       17339    17339           
  Branches     5066     5066           
=======================================
  Hits        11612    11612           
  Misses       5695     5695           
  Partials       32       32           

Impacted Files	Coverage Δ
packages/jest-phabricator/src/index.ts	0.00% <0.00%> (ø)

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[github-actions]

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