NIST IR 7217 `<title>` has a mis-placed colon preceded by a space

[ronaldtse]

For NIST IR 7217, the XML data <title> element contains a whitespace before the colon.

    <report-paper_metadata language="en">
       <contributors>
          <person_name sequence="first" contributor_role="author">
             <given_name>Ulrich D</given_name>
             <surname>Jentschura</surname>
          </person_name>
          <person_name sequence="additional" contributor_role="author">
             <given_name>Peter J</given_name>
             <surname>Mohr</surname>
          </person_name>
       </contributors>
       <titles>
          <title>Precise theory of levels of hydrogen and deuterium :</title>
          <subtitle>the two-photon radiative corrections</subtitle>
       </titles>
       <edition_number>0</edition_number>
       <publication_date media_type="online">
          <year>2005</year>
       </publication_date>
       <publisher>
          <publisher_name>National Institute of Standards and Technology</publisher_name>
          <publisher_place>Gaithersburg, MD</publisher_place>
       </publisher>
       <institution>
          <institution_name>National Institute of Standards and Technology</institution_name>
          <institution_acronym>NIST</institution_acronym>
          <institution_place>Gaithersburg, MD</institution_place>
       </institution>
       <publisher_item>
          <item_number item_number_type="report-number">NIST IR 7217</item_number>
       </publisher_item>
       <doi_data>
          <doi>10.6028/NIST.IR.7217</doi>
          <resource>https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir7217.pdf</resource>
       </doi_data>
    </report-paper_metadata>
 </report-paper>

The whitespace preceding the colon in:

          <title>Precise theory of levels of hydrogen and deuterium :</title>

Should be removed.

From: https://github.com/relaton/relaton-data-nist/issues/3