[REF] barcodes: form view: multiples button for a single trigger

This commit allows multiple button to share the same `barcode_trigger`
attribute. Note that it only makes sense if a single button is displayed
at a time.

Task: 1831245

addons/barcodes/static/src/js/barcode_form_view.js

@@ -406,8 +406,13 @@ FormRenderer.include({
             }
             return $.when();
         };
+        var name = node.attrs.name;
+        if (node.attrs.string) {
+            name = name + '_' + node.attrs.string;
+        }
+
         this.trigger_up('activeBarcode', {
-            name: node.attrs.name,
+            name: name,
             commands: commands
         });
     },