Correct keymap matching EAD XML import, Refs #9992
Correct keymap matching EAD XML import, Refs #9992

Dropping clause '$importSchema == 'ead'' as it does not work ($importSchema
is not available in this function) and is redundant since eadUrl will only be
set when loading an EAD XML file.

artefactual/atom,artefactual/atom,artefactual/atom