Return the data name as the action key when launching the graph_open action

The ids of each record is in fact indexed by the name of the label in a pie
chart

Closes #14340
(grafted from b69cd826844dd5625eafd75e15d06db5b1300427)

--HG--
branch : 6.0

sao/src/view/graph.js

@@ -366,7 +366,8 @@
             Sao.View.Graph.Pie._super._add_id.call(this, key, id);
         },
         _action_key: function(data) {
-            return data.id;
+            // data.name is the label used for the x axis
+            return data.name;
         }
     });