Inconsistent behaviour of enketo relevant field in cht-production vs harness

[kennsippell]

Update family_planning_men form for production muso configuration.

For field: visited_contact_uuid set relevant to ${s_reg_how_found} = 'during_home_visit' and calculation to ../inputs/contact/parent/_id.

Run this configuration and test scenario:

1. Fill in family_planning_men form specifying the visit was a 'house visit'
2. fields.visited_contact_uuid is set properly

Execute the following test:

  it('home visit', async () => {
    const inputs = familyPlanningForMenScenarios.noCouncil();
    const result = await harness.fillForm(Forms.FAMILY_PLANNING_FOR_MEN, ...inputs);
    expect(result.report.fields.visited_contact_uuid).to.eq(contactId);
  });

Test fails because result.report.fields.visited_contact_uuid is empty.
Workaround is to set calculation value to if(${s_reg_how_found} = 'during_home_visit', ../inputs/contact/parent/_id,’’) which works for both test harness and e2e testing.
https://github.com/medic/config-muso/pull/160#discussion_r548356070

Investigate and correct whatever is causing the difference?

[derickl]

Related to #133

[kennsippell]

Closing as duplicate of #133.