Remove extraneous filename idno.

Author: hcayless

HGV_meta_EpiDoc/HGV999/998114.xml

@@ -9,7 +9,6 @@
             <publicationStmt>
                 <idno type="filename">998114</idno>
                 <idno type="TM">998114</idno>
-                <idno type="filename">ddbdp.2021.4</idno>
                 <idno type="ddb-hybrid">ddbdp;2021;4</idno>
             </publicationStmt>
             <sourceDesc>