Add whitespace to Cite

[acozine]

As a user, when I export a folder using the Cite option, I'd like to have a visual separation between the end of one item in the folder and the start of the next item.

ACCEPTANCE:

• There is whitespace between the end of one item and the title of the next when a user exports a folder using Cite

[mark-dce]

Moving this to future scope since it is a result of existing blacklight behavior: existing bookmarks currently function this way as well. In order to fix this correctly, you would need to make the fix to the citation export code in blacklight (core) rather than blacklight_folder.