Re-selecting the first of the previous two

[Mattschu]

When klicking on the first of the two tiles that just have been opened it is hidden but the programm thinks it's selected.
Source: "memory.java" onPosition() case 2 does call unselect but the selection is done before the switch case block. To fix this I believe you simply need to move the "tile.select();" statement to after the switch case block, just near "mSelectedCount++;".
I have just created a branch and pull-request.