fix: only last unregistered DwC field appears in Specimen Record page

A prior commit [ d1bae77 ]
renamed multiple references from 'record' to 'localRecord' during the
construction of the RecordPage JSX element,
and this reference might have accidentally been skipped.

It appears the intent was to pre-emptively define localRecord['other']
as an array to avoid calling push() on <undefined>.
But by not also renaming this 'record' reference, localRecord['other']
was constantly being reset as a blank array.

*DwC = Darwin Core

(cherry picked from commit a68fbff)

public/client/js/react/src/record.js

@@ -543,7 +543,7 @@ const RecordPage = ({ record }) => {
     const dif = _.difference(Object.keys(canonical), has);
     _.each(dif, function (item) {
         if (item.indexOf('idigbio:') === -1) {
-            if (_.isUndefined(record['other'])) {
+            if (_.isUndefined(localRecord['other'])) {
                 localRecord['other'] = [];
             }
             const datum = {};