fix output label

Author: shiltemann

tools/quicktree/quicktree.xml

@@ -65,7 +65,7 @@ input.quicktree
         </param>
     </inputs>
     <outputs>
-        <data name="output_file" format="newick" label="${tool.name} on ${on_string}: stockholm format">
+        <data name="output_file" format="newick" label="${tool.name} on ${on_string}: Tree">
             <change_format>
                 <when input="output_type" value="dist_out" format="mothur.dist" />
             </change_format>