Change script/plymouth name to match directory name

themes/arise/animation.png

themes/arise/arise.plymouth

themes/arise/arise.script

themes/arise/background.png

themes/arise/box.png

themes/arise/bullet.png

themes/arise/entry.png

themes/arise/install.sh

themes/arise/lock.png

themes/arise/logo.png

themes/arise/motif.png

themes/arise/progress_bar.png

themes/arise/progress_box.png

themes/arise/progress_box_background.png

themes/arise/progress_box_edge.png

themes/arise/suspend.png