mozilla side of fix for bugscape 1638 - only show ISPs which explicitly request it

r=mscott

mailnews/base/prefs/resources/content/aw-accounttype.xul

@@ -26,6 +26,7 @@ Rights Reserved.
 <!DOCTYPE window SYSTEM "chrome://messenger/locale/aw-accounttype.dtd" >
 <window id="accounttype" 
     xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+    xmlns:nc="http://home.netscape.com/NC-rdf#"
     class="dialog"
     onload="dump('** acctype onload\n'); parent.wizardManager.onPageLoad('accounttype');"
     orient="vertical"
@@ -52,10 +53,12 @@ Rights Reserved.
                   id="ispBox"
                   ref="NC:ispinfo">
         <template>
+          <rule nc:wizardShow="true">
           <radio group="ispchoice" uri="..."
                  wsm_persist="true"
                  fakeid="rdf:http://home.netscape.com/NC-rdf#wizardShortName"
                  value="rdf:http://home.netscape.com/NC-rdf#wizardLongName"/>
+          </rule>
         </template>
       </box>
       <radio group="ispchoice" value="&accountTypeISP.label;"