Correct search index definitions for subject|complete and identifier|bibcn

Correct search index definitions for subject|complete and identifier|bibcn

Dan Wells reported in LP# 729385 that the index definitions for
subject|complete and identifier|bibcn were not working, and traced
the problem to a change in how indexes are generated in 2.0+. Dropping
the trailing '//text()' on these two indexes addresses the problem.

Sites upgrading from a previous version of Evergreen 2.0 will want
to refresh the indexes after applying this schema change to enable
searches against subject|complete and identifier|bibcn to work.

git-svn-id: svn://svn.open-ils.org/ILS/branches/rel_2_0@19589 dcc99617-32d9-48b4-a31d-7c20da2025e4