fixes issue when called by xqsuite

modules/config/config.xqm

@@ -79,7 +79,7 @@ declare variable $config:project :=
   return if($value="") then "textgrid" else $value;
 declare variable $config:configDoc := doc( $config-params:projects-dir || $config:project || "/config.xml" );
 declare variable $config:configMap := map:new(
-                                for $param in $config:configDoc/config/*[@key]
+                                for $param in $config:configDoc/config/*[./@key]
                                 return map:entry(string($param/@key), string($param))
                             );