SyndicationFeed still contains references to JSPUI and XMLUI

[saschaszott]

Bug Description

In org.dspace.app.util.SyndicationFeed some references to JSPUI and XMLUI are still present.

Furthermore, OpenSearchController has a reference to SyndicationFeed.UITYPE_JSPUI in

labelMap.put(SyndicationFeed.MSG_UITYPE, SyndicationFeed.UITYPE_JSPUI);

@tdonohue , I can try to fix this problem but I'm not sure if MSG_UITYPE is completely obsolete in DS 7 and can be safely removed from SyndicationFeed? I can confirm that old (DS5) RSS feed URLs do not contain any reference to the UI mode.

[tdonohue]

@saschaszott : Yes, it appears to me that MSG_UITYPE may be no longer necessary and likely should be entirely removed.

[tdonohue]

Claiming this as I had time to look into it. It's a quick fix & necessary to patch soon. The RSS/Atom feeds are returning invalid URLs for bitstreams (e.g. community/collection logos). I'll create the PR today.