[pfff] update spacing in prolog tests
[pfff] update spacing in prolog tests

Summary:
When running swipl 5.7, the (insignificant) whitespace in
 facts did not quite match up with what the tests were expecting

  > swipl --version
  SWI-Prolog version 5.7.11 for x86_64-linux

Test Plan:
  make test (prolog tests now pass)

Reviewers: andrewparoski, pieter

Reviewed By: pieter

Differential Revision: https://phabricator.fb.com/D1816838

Signature: t1:1816838:1422670201:f3643b7ebccfd407bea23227a5c3fd4f5c382c3b

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