Fix 58509: add button doesn't disable when pasting/deleting text from context menu. r=matt sr=alecf

xpfe/components/prefwindow/resources/content/pref-smart_browsing.xul

@@ -205,7 +205,7 @@
         <row>
           <box autostretch="never">
             <text class="label" id="domainText" value="&domain.label;" accesskey="&domain.accesskey;" for="addDomain"/>
-            <textfield id="addDomain" flex="1" onkeyup="doButtonEnabling();"/>
+            <textfield id="addDomain" flex="1" oninput="doButtonEnabling();"/>
           </box>
           <button disabled="true" class="dialog" id="addDomainButton" value="&addDomain.label;" accesskey="&addDomain.accesskey;"
                   oncommand="addDomain();"/>