Add missing layout variable
Created by: sanks64
LAYOUT_DIR
disappeared after https://github.com/vinceliuice/ChromeOS-kde/commit/032196e67cda7f87cf404cb37e85575b3e68deb0
Created by: sanks64
LAYOUT_DIR
disappeared after https://github.com/vinceliuice/ChromeOS-kde/commit/032196e67cda7f87cf404cb37e85575b3e68deb0