fix for #90678. more regressions caused by bad box -> vbox landing.

r/sr=bienvenu

mailnews/base/prefs/resources/content/SmtpServerEdit.xul

@@ -40,7 +40,7 @@
 
 <script type="application/x-javascript" src="SmtpServerEdit.js"/>
 <keyset id="dialogKeys"/>
-<hbox id="smtpServerEditor"/>
+<vbox id="smtpServerEditor"/>
 <separator/>
 <hbox id="okCancelButtonsRight"/>