fix(query-builder): fix edit/close buttons now tabindexed properly

Author: ivanvpetrov

projects/igniteui-angular/src/lib/query-builder/query-builder-tree.component.html

@@ -147,17 +147,19 @@ <h6 class="igx-filter-empty__title">
                     expressionItem.hovered
                 "
             >
-                <span tabindex="0">
+                <span tabindex="-1">
                     <igx-icon
+                        tabindex="0"
                         family="default"
                         name="edit"
                         (keydown)="invokeClick($event)"
                         (click)="enterExpressionEdit(expressionItem)"
                     >
                     </igx-icon>
                 </span>
-                <span tabindex="0">
+                <span tabindex="-1">
                     <igx-icon
+                        tabindex="0"
                         family="default"
                         name="add"
                         (keydown)="invokeClick($event)"