Set the default remote application to 'moodle' when configuring an XMLRPC...

Set the default remote application to 'moodle' when configuring an XMLRPC plugin, as this is by far and away the most popular choice.

htdocs/auth/xmlrpc/lib.php

@@ -746,7 +746,7 @@ class PluginAuthXmlrpc extends PluginAuth {
             'collapseifoneoption' => true,
             'multiple'            => false,
             'options'             => $apparray,
-            'defaultvalue'        => empty($tmpappname)? key($apparray) : $tmpappname,
+            'defaultvalue'        => empty($tmpappname)? 'moodle' : $tmpappname,
             'help'                => true
         );