Modify 041 validation

[jenniferward]

Follow-up of #1896

This record is flagging as an error but it is correct: https://muscat.rism.info/admin/sources/1001365598
=041 0#$ager$hfre
=041 0#$afre

041 a This cannot be identical to the other value in the field [must_be_different-041h]
The second $afre is identical with the first $hfre.

The validation should check that 041a and 041h are different in the same field.