rdf:datasources --> datasources in DOMDataSourceViewer.xul, bug=53297, r=rjc, a=waterson

rdf/tests/domds/resources/DOMDataSourceViewer.xul

@@ -25,7 +25,7 @@
     <button onclick="refreshTree();" value="Refresh"/>
   </box>
 <tree
-  rdf:datasources="rdf:domds"
+  datasources="rdf:domds"
   id="dataSourceTree">
 
   <template>