Settings: Fix there is no sounds and delays 1s when pressing "Touch sounds" sometimes

[Procedures]
1.Enter Settings->Sound & notification->Other sounds
2.Press "Touch sounds" switch several times

[Results]
There is no sound when closing "touch sound" option sometimes and it is slower than other options

Change-Id: I9546cb4e5e3d17be234bbf39d7feba1bdcbd6a47