[CEC] fixed - screensaver being activated sends the tv to standby, which makes the TV send another standby command. this standby command sent the PC to standby in some occasions
[CEC] increased SCREENSAVER_TIMEOUT from 10 to 20 seconds. philips sends another standby command after it's powered everything down, which takes up to 15 seconds (20 to be on the safe side)
Merge pull request #3813 from opdenkamp/morececfixes

[CEC] fixed PC going to standby when the screensaver is activated