MAGETWO-71835: [Product grid] SC's values aren't sorted alphabetically in the tooltip

- Sort values case insensitive

Author: VeronikaYarats

app/code/Magento/Ui/view/base/web/js/grid/columns/expandable.js

@@ -68,8 +68,8 @@ define([
             });
 
             return labels.sort(
-                function (a, b) {
-                    return a.toLowerCase().localeCompare(b.toLowerCase());
+                function (labelFirst, labelSecond) {
+                    return labelFirst.toLowerCase().localeCompare(labelSecond.toLowerCase());
                 }
             );
         },

dev/tests/js/jasmine/tests/app/code/Magento/Ui/base/js/grid/columns/expandable.test.js

@@ -72,7 +72,7 @@ define([
 
         describe('getLabelsArray method', function () {
             it('check if label array sort alphabetically case insensitive', function () {
-                record['shared_catalog'].push(1, 2 , 3);
+                record['shared_catalog'].push(1, 2, 3);
                 expandable.options.push({
                     label: 'Default',
                     value: '1'