js: remove required restriction on fieldSchema

[carlinmack]

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Description

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The only time fieldSchema is only used as follows:

if (fieldSchema?.escape) {
      return <div dangerouslySetInnerHTML={{ __html: value }} />;
}

and when fieldSchema was committed:

e30d0f8

the other reference to this function was not updated:

https://github.com/inveniosoftware/invenio-administration/blob/main/invenio_administration/assets/semantic-ui/js/invenio_administration/src/search/SearchResultItem.js#L68-L80

Therefore I think we can just say it's not required as the implementation accounts for it not having the key

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