bug 264881 removes extra separator. r/sr=mscott

mailnews/base/prefs/resources/content/am-addressingOverlay.xul

@@ -60,7 +60,6 @@
           pref="true" preftype="bool" prefattribute="value"
           prefstring="mail.identity.%identitykey%.attach_signature"/>
 
-    <separator class="thin"/>
     <groupbox>
       <caption label="&compositionGroupTitle.label;"/>
       <hbox align="center">