bug 229913 Remove unused defaultengine.label from pref-search.dtd

patch by durbacher@gmx.de (Andreas Kunz)
neil.parkwaycc.co.uk: review+
alecf: superreview+

xpfe/components/prefwindow/resources/locale/en-US/pref-search.dtd

@@ -11,7 +11,6 @@
 <!ENTITY  openSidebarSearchPanel.label    "Open the Search tab in the Sidebar when search results are available">
 <!ENTITY  openSidebarSearchPanel.accesskey "o">
 
-<!ENTITY  defaultengine.label             "Netscape Search">
 <!ENTITY  searchResults.label             "Search Results">
 
 <!ENTITY  sidebarSearchTabPref.label      "Sidebar Search Tab Preference">