Only send <Standby> to TV on sleep when active source

Test: make, flash, let device go to sleep due to keycode_power and
energy saver mode, verify that <Standby> is only sent when mIsActiveSource is true.

Bug: 155228844
Change-Id: Ie62d60e8c4fa573aac6c08a4c1093d5f1a52d7f3
1 file changed