Update Maryland TANF to use employment_income

[SirMalamute]

Fixes #4222

copilot:all

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.16%. Comparing base (8db0cd9) to head (3409e1f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4223   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files        2405     2405           
  Lines       34803    34803           
  Branches      163      163           
=======================================
  Hits        34514    34514           
  Misses        259      259           
  Partials       30       30           

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