handle ASCII characters in abstract #6156
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Closes #6153 .
What this PR does:
Unescapes ASCII characters like $#13; (which is carriage return).
The mods display gem has additional handling around dealing with HTML encoding, and the unescape method is called before the text is passed on to the Mods Display component(see https://github.com/sul-dlss/mods_display/blob/main/app/helpers/mods_display/record_helper.rb#L103 ).
Note: These changes affect only abstract. Question: Do we want to address other content as well on the page or is this change sufficient?