[FIX] web: appropriate symbol in mobile embedded graph view groupby menu

addons/web/static/src/js/views/control_panel/search/groupby_menu.js

@@ -41,6 +41,7 @@ var GroupByMenu = DropdownMenu.extend({
      */
     init: function (parent, groupBys, fields, options) {
         var self = this;
+        options = options || {};
         this._super(parent, groupBys);
         this.fields = fields;
         // determines when the 'Add custom groupby' submenu is open
@@ -65,9 +66,9 @@ var GroupByMenu = DropdownMenu.extend({
         this.dropdownCategory = 'groupby';
         this.dropdownTitle = _t('Group By');
         this.dropdownIcon = 'fa fa-bars';
-        this.dropdownSymbol = this.isMobile ? 'fa fa-chevron-right float-right mt4' : false;
+        this.dropdownSymbol = this.isMobile && !options.noSymbol ? 'fa fa-chevron-right float-right mt4' : false;
         // the default style of the groupby menu can be changed here using the options key 'headerStyle'
-        if (options && options.headerStyle === 'primary') {
+        if (options.headerStyle === 'primary') {
             this.dropdownStyle = {
                 el: {class: 'btn-group o_group_by_menu o_dropdown', attrs: {'role': 'group'}},
                 mainButton: {class: 'btn btn-primary dropdown-toggle'},

addons/web/static/src/js/views/control_panel/search/groupby_menu_mixin.js

@@ -44,7 +44,7 @@ var GroupByMenuMixin = {
         });
         this.groupableFields = groupableFields;
         var groupBys = this._getGroupBys(this.model.get().groupBy);
-        this.groupByMenu = new GroupByMenu(this, groupBys, this.groupableFields);
+        this.groupByMenu = new GroupByMenu(this, groupBys, this.groupableFields, {noSymbol: true});
         return this.groupByMenu.insertAfter($node.find('div:first'));
     },
     /**