Compare keyword_open to 1

It is needed to correctly test "0" as false

issue5379
review23021002

src/board.js

@@ -273,7 +273,7 @@
             }
 
             if (this.screen.current_view.view_type == 'tree' &&
-                    ('keyword_open' in this.screen.current_view.attributes)) {
+                    (this.screen.current_view.attributes.keyword_open == 1)) {
                 record_ids = this.screen.current_view.selected_records().map(
                         function(record) { return record.id; });
                 Sao.Action.exec_keyword('tree_open', {

src/screen.js

@@ -953,7 +953,7 @@
         },
         default_row_activate: function() {
             if ((this.current_view.view_type == 'tree') &&
-                    this.current_view.attributes.keyword_open) {
+                    (this.current_view.attributes.keyword_open == 1)) {
                 Sao.Action.exec_keyword('tree_open', {
                     'model': this.model_name,
                     'id': this.get_id(),