lightmediascanner: add ~/Videos to initial media scan

lightmediascanner: add ~/Videos to initial media scan

Index users ~/Videos directory on initial systemd service startup.

Bug-AGL: SPEC-1169
Change-Id: I536c85fa811153e980acc489db128dd02251e00d
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/12373
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>