Make dir shortcuts use XDG DIRS and then use a default if need be (#725)

* sort and make home shortcut break less

* Update directories

* Formatting

* Add missing brackets

* sort

Co-authored-by: Luke Smith <luke@lukesmith.xyz>

.config/directories

@@ -1,11 +1,11 @@
 # You can add comments to these files with #
-d	~/Documents
-D	~/Downloads
-h	${HOME:-~/}
-m	~/Music
-pp	~/Pictures
-vv	~/Videos
-cf	${XDG_CONFIG_HOME:-$HOME/.config}
-cac	${XDG_CACHE_HOME:-$HOME/.cache}
-mn	/mnt
-sc 	~/.local/bin
+cac ${XDG_CACHE_HOME:-$HOME/.cache}
+cf  ${XDG_CONFIG_HOME:-$HOME/.config}
+D   ${XDG_DOWNLOAD_DIR:-$HOME/Downloads}
+d   ${XDG_DOCUMENTS_DIR:-$HOME/Documents}
+h   ${XDG_CONFIG_HOME:-$HOME}
+m   ${XDG_MUSIC_DIR:-$HOME/Music}
+mn  /mnt
+pp  ${XDG_PICTURES_DIR:-$HOME/Pictures}
+sc  ~/.local/bin
+vv  ${XDG_VIDEOS_DIR:-$HOME/Videos}