QQuickTableView: Don't fallthrough from tab/backtab to esc key

We probably don't want to close the editor if we didn't handle the tab
key.

Amends commit ed83f0f795.

Pick-to: 6.5
Change-Id: I11c8f52d5ec8e1b67074ebf25d4cf4b35eb6b7e8
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

src/quick/items/qquicktableview.cpp

@@ -6263,6 +6263,7 @@ bool QQuickTableView::eventFilter(QObject *obj, QEvent *event)
                 }
                 return true;
             }
+            break;
         case Qt::Key_Escape:
             closeEditor();
             return true;