oops, missed this file for #23391, actually include accountUtils.js

r=sspitzer

mailnews/base/resources/content/messenger.xul

@@ -53,6 +53,7 @@ Rights Reserved.
 <html:script src="chrome://messenger/content/msgMail3PaneWindow.js"/>
 <html:script src="chrome://messenger/content/mailContextMenus.js"/>
 <html:script src="chrome://messenger/content/messengerdnd.js"/>
+<html:script src="chrome://messenger/content/accountUtils.js"/>
 
 <commands id="commands">
 	<commandset id="CommandUpdate_Mail"