XMLUI: Revert to non-caching pipeline

This was an issue in DSpace 1.7/1.8... but we've got DSpace 4.2 plus
an entirely new JDK, Tomcat, Linux kernel, etc.  I'm reversing this
to see if the caching bug is still an issue.

Use the following command to do it:

	find dspace/modules/xmlui/src/main/webapp/themes -iname sitemap.xmap -exec sed -i 's/<map:pipeline type="noncaching">/<map:pipeline>/' {} \;