Tuning incorrect background of grid item selected state

Tuning grid item background border to meet Mock design on selection
- Selected by keyboard(Shift + Navigation Keys)
- Focus by navigation key event
- Selected by Mouse Hover
- Selected by TP long press and drag

Bug: 115446345
Test: atest DocumentsUITests
      manual test to see visual

Change-Id: Ibde27656f45ea89e9179a3fa6c48bed9c87062e5