[server/sources] fix name error in eid_type_source_pre_131 i.e. the eid_type_source implementation used when some pre 3.13.1 database is detected. Regression from 5fbdbbe51867.

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sync_schema_props_perms('cwuri')

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helper = repo.system_source.dbhelper

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cu = session.cnxset.cu

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helper.set_null_allowed(cu, 'moved_entities', 'extid', 'VARCHAR(256)', False)

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commit()