Fix Grid to not refresh already focused cell (#19653)

This removes a row repaint when a cell that already has focus is clicked
again.

Change-Id: I3e4f4f1aec49e2128cd47f7c0b1b1bb4611fbb04

client/src/com/vaadin/client/widgets/Grid.java

@@ -2527,7 +2527,6 @@ public class Grid<T> extends ResizeComposite implements
             if (rowIndex == rowWithFocus
                     && cellFocusRange.contains(columnIndexDOM)
                     && container == this.containerWithFocus) {
-                refreshRow(rowWithFocus);
                 return;
             }