chore(*): fixing failing test and sass selector

Author: mddragnev

projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-component.scss

@@ -544,7 +544,7 @@
         @extend %igx-grid__row-editing-outlet !optional;
     }
 
-    @include e(grid-addrow-snackbar) {
+    @include e(addrow-snackbar) {
         @extend %igx-grid__addrow-snackbar !optional;
     }
 

projects/igniteui-angular/src/lib/expansion-panel/expansion-panel.spec.ts

@@ -1010,7 +1010,7 @@ describe('igxExpansionPanel', () => {
             expect(grid.attributes.getNamedItem('ng-reflect-auto-generate').nodeValue).toEqual('true');
             expect(grid.attributes.getNamedItem('ng-reflect-width').nodeValue).toEqual(fixture.componentInstance.width);
             expect(grid.attributes.getNamedItem('ng-reflect-height').nodeValue).toEqual(fixture.componentInstance.height);
-            expect(grid.childElementCount).toEqual(7);
+            expect(grid.childElementCount).toEqual(8); // +1 because of add row snackbar
         }));
         it('Should apply all appropriate classes on combo initialization_image + text content', fakeAsync(() => {
             const fixture: ComponentFixture<IgxExpansionPanelImageComponent> = TestBed.createComponent(IgxExpansionPanelImageComponent);