Prevent default event when clicking on Many2One link from a tree view

If the event is not prevented, the URL is cleared if there is already a tab for
the resource because the tab show event update the URL before the execution of
the default event.

Closes #14453
(grafted from 4f4137559b00b9f377a0f6f0c918e292297a8950)

--HG--
branch : 7.0

sao/src/view/tree.js

@@ -2613,6 +2613,7 @@
                 view_ids.shift();
             }
             cell.click(event => {
+                event.preventDefault();
                 event.stopPropagation();
                 var params = {};
                 params.model = this.attributes.relation;