[19.0][FIX] hr_employee_firstname: Use work_contact_id instead of address_home_id

[BT-pkosnik]

Changes needed until this PR is not merged in OCA.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.66%. Comparing base (9e10d5a) to head (6a2937b).
⚠️ Report is 16 commits behind head on 19.0.project_SV_911.

Files with missing lines	Patch %	Lines
hr_employee_firstname/models/hr_employee.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##           19.0.project_SV_911    #1202   +/-   ##
====================================================
  Coverage                95.66%   95.66%           
====================================================
  Files                       58       58           
  Lines                     1245     1245           
  Branches                   119      119           
====================================================
  Hits                      1191     1191           
  Misses                      29       29           
  Partials                    25       25           

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