fix(exporter): fix issue #6019 errors while opening grid menu with exporter service

change the exporter menu items which use "this.grid" to using simply "grid"

fix #6019

Author: Matthew Vukomanovic

src/features/exporter/js/exporter.js

@@ -687,31 +687,31 @@
             {
               title: i18nService.getSafeText('gridMenu.exporterAllAsExcel'),
               action: function ($event) {
-                this.grid.api.exporter.excelExport( uiGridExporterConstants.ALL, uiGridExporterConstants.ALL );
+                grid.api.exporter.excelExport( uiGridExporterConstants.ALL, uiGridExporterConstants.ALL );
               },
               shown: function() {
-                return this.grid.options.exporterMenuExcel && this.grid.options.exporterMenuAllData;
+                return grid.options.exporterMenuExcel && grid.options.exporterMenuAllData;
               },
               order: grid.options.exporterMenuItemOrder + 6
             },
             {
               title: i18nService.getSafeText('gridMenu.exporterVisibleAsExcel'),
               action: function ($event) {
-                this.grid.api.exporter.excelExport( uiGridExporterConstants.VISIBLE, uiGridExporterConstants.VISIBLE );
+                grid.api.exporter.excelExport( uiGridExporterConstants.VISIBLE, uiGridExporterConstants.VISIBLE );
               },
               shown: function() {
-                return this.grid.options.exporterMenuExcel && this.grid.options.exporterMenuVisibleData;
+                return grid.options.exporterMenuExcel && grid.options.exporterMenuVisibleData;
               },
               order: grid.options.exporterMenuItemOrder + 7
             },
             {
               title: i18nService.getSafeText('gridMenu.exporterSelectedAsExcel'),
               action: function ($event) {
-                this.grid.api.exporter.excelExport( uiGridExporterConstants.SELECTED, uiGridExporterConstants.VISIBLE );
+                grid.api.exporter.excelExport( uiGridExporterConstants.SELECTED, uiGridExporterConstants.VISIBLE );
               },
               shown: function() {
-                return this.grid.options.exporterMenuExcel && this.grid.options.exporterMenuSelectedData &&
-                  ( this.grid.api.selection && this.grid.api.selection.getSelectedRows().length > 0 );
+                return grid.options.exporterMenuExcel && grid.options.exporterMenuSelectedData &&
+                  ( grid.api.selection && grid.api.selection.getSelectedRows().length > 0 );
               },
               order: grid.options.exporterMenuItemOrder + 8
             }