Add missing bind on XXX2Many edit and add

Changeset 5b447f80162c added async callbacks when opening and editing XXX2Many
fields, but they were not bound to the correct object so the object properties
are not read correcty.

issue5780
review31411002

src/view/form.js

@@ -2441,7 +2441,7 @@
                                     title: this.attributes.string
 
                         });
-                    };
+                    }.bind(this);
 
                     var make_product = function() {
                         if (jQuery.isEmptyObject(product)) {
@@ -2474,8 +2474,8 @@
                     };
 
                     search_set();
-                });
-            });
+                }.bind(this));
+            }.bind(this));
         },
         open: function(event_) {
             this.edit();
@@ -2760,7 +2760,7 @@
             screen.switch_view().done(function() {
                 new Sao.Window.Form(screen, callback,
                     {title: this.attributes.string});
-            });
+            }.bind(this));
         },
         new_: function() {
             var screen = this._get_screen_form();
@@ -2778,7 +2778,7 @@
                     title: this.attributes.string,
                     rec_name: this.entry.val()
                 });
-            });
+            }.bind(this));
         }
     });