make url column crop right, since crop middle does the wrong thing. r=ben, bug#50833

xpfe/components/bookmarks/resources/bookmarks.xul

@@ -230,7 +230,7 @@
              web:status="rdf:http://home.netscape.com/WEB-rdf#status"
              rdf:type="rdf:http://www.w3.org/1999/02/22-rdf-syntax-ns#type"
              loading="rdf:http://home.netscape.com/NC-rdf#loading" />
-           <treecell crop="center"
+           <treecell crop="right"
              value="rdf:http://home.netscape.com/NC-rdf#URL"/>
            <treecell
              value="rdf:http://home.netscape.com/NC-rdf#ShortcutURL"/>