TableOutputComponent: Fix selectStartIndex assigned to itself

Consistently apply line 630's comment by properly assigning
selectStartIndex to selectEndIndex in line 635's specific case.

Basically, make the latter the reciprocal of line 632's case, as
originally intended.

Contributes to fixing #859.

Signed-off-by: Marco Miller <marco.miller@ericsson.com>

packages/react-components/src/components/table-output-component.tsx

@@ -632,7 +632,7 @@ export class TableOutputComponent extends AbstractOutputComponent<TableOutputPro
                 this.selectEndIndex = this.selectStartIndex;
             }
             if (this.selectEndIndex !== -1 && this.selectStartIndex === -1) {
-                this.selectStartIndex = this.selectStartIndex;
+                this.selectStartIndex = this.selectEndIndex;
             }
 
             let currRowIndex = 0;