Fix bug in getting OriginalFileLoadedIntoOmeka

Had to shorten the string given to start-with() from
item_-_OriginalFileLoadedIntoOmeka_
to
item_-_OriginalFileLoadedIntoOmeka
in order to handle to case where there is only one
OriginalFileLoadedIntoOmeka field per item in the
prepped remediated metadata, which may give an element tag
as follows: <item_-_OriginalFileLoadedIntoOmeka>, instead
of <item_-_OriginalFileLoadedIntoOmeka_1>,
<item_-_OriginalFileLoadedIntoOmeka_2>, etc.
Regenerate MODS due to change in mapRemediatedOmekaMetadataToMods.xsl

In mapRemediatedOmekaMetadataToMods.xsl, fix bug that would not process
<item_-_OriginalFileLoadedIntoOmeka>.