AOSP/DeskClock - Fix deprecated calls: ScreensaverSettings,SettingsActivity

Test: manual, tested the DeskClock UI. As well tests were ran as follows

$ source build/envsetup.sh
$ lunch aosp_sargo-userdebug
$ make DeskClock
$ adb install out/target/product/sargo/product/app/DeskClock/DeskClock.apk
$ atest DeskClockTests
$ make DeskClockJava
$ adb install out/target/product/sargo/product/app/DeskClockJava/DeskClockJava.apk
$ atest DeskClockTests

BUG: 157255731
Change-Id: Iecbbe5b390e8121bd6131431b2fd2f2c56467428