Change test for existence of Subrepository

In the Music at Columbia remediated metadata, the subrepository
element is called <item_-_MODS_-_Subrepository_1>. It was
called <item_-_MODS_-_Subrepository> in previous
remediated collection, and test looked for an exact match.
Code now test for any element name starting with
item_-_MODS_-_Subrepository
Regenerate MODS due to subrepo bug fix