chore(*): update failing tests

Author: nrobakova

projects/igniteui-angular/src/lib/grids/grid/grid.search.spec.ts

@@ -890,7 +890,7 @@ describe('IgxGrid - search API', () => {
             activeHighlight = rv.querySelector('.' + component.activeClass);
             expect(activeHighlight).toBeNull();
 
-            cell.setEditMode(true);
+            cell.setEditMode(false);
             await wait(16);
             fix.detectChanges();
 

projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-integration.spec.ts

@@ -457,7 +457,7 @@ describe('IgxTreeGrid - Integration ', () => {
 
             // Edit child row child cell
             const childCell = grid.getCellByColumn(4, 'Name');
-            childCell.editMode = true;
+            childCell.setEditMode(true);
             fix.detectChanges();
 
             let banner = fix.debugElement.query(By.css('.' + CSS_CLASS_BANNER));