Install cheese to ensure that video dependencies exist

src/freedombone-image-customise

 	# desktop
 	chroot "$rootdir" apt-get -y install mate-desktop-environment
 
+	# ensure that the dependencies for video calls are installed
+	chroot "$rootdir" apt-get -y install cheese
+
 	# tool to change desktop settings from command line
 	chroot "$rootdir" apt-get -y install dconf-cli dconf-gsettings-backend dbus dbus-x11