dmenumount fix + improvements (#602)

* Remove misleading character escape.

Everything is in single quotes, so shell will escape it correctly
without backslashes. Fixes #440.

* Remove lsblk type restriction.

* Make it possible to cancel with ESC in dmenu.

Up to now if you pressed ESC to cancel the program would just continue
with incorrect data.

.local/bin/dmenuumount

@@ -6,25 +6,27 @@
 
 unmountusb() {
 	[ -z "$drives" ] && exit
-	chosen=$(echo "$drives" | dmenu -i -p "Unmount which drive?" | awk '{print $1}')
+	chosen="$(echo "$drives" | dmenu -i -p "Unmount which drive?")" || exit 1
+	chosen="$(echo "$chosen" | awk '{print $1}')"
 	[ -z "$chosen" ] && exit
 	sudo -A umount "$chosen" && notify-send "💻 USB unmounting" "$chosen unmounted."
 	}
 
 unmountandroid() { \
-	chosen=$(awk '/simple-mtpfs/ {print $2}' /etc/mtab | dmenu -i -p "Unmount which device?")
+	chosen="$(awk '/simple-mtpfs/ {print $2}' /etc/mtab | dmenu -i -p "Unmount which device?")" || exit 1
 	[ -z "$chosen" ] && exit
 	sudo -A umount -l "$chosen" && notify-send "🤖 Android unmounting" "$chosen unmounted."
 	}
 
 asktype() { \
-	case "$(printf "USB\\nAndroid" | dmenu -i -p "Unmount a USB drive or Android device?")" in
+	choice="$(printf "USB\\nAndroid" | dmenu -i -p "Unmount a USB drive or Android device?")" || exit 1
+	case "$choice" in
 		USB) unmountusb ;;
 		Android) unmountandroid ;;
 	esac
 	}
 
-drives=$(lsblk -nrpo "name,type,size,mountpoint" | awk '$2=="part"&&$4!~/\/boot|\/home$|SWAP/&&length($4)>1{printf "%s (%s)\n",$4,$3}')
+drives=$(lsblk -nrpo "name,type,size,mountpoint" | awk '$4!~/\/boot|\/home$|SWAP/&&length($4)>1{printf "%s (%s)\n",$4,$3}')
 
 if ! grep simple-mtpfs /etc/mtab; then
 	[ -z "$drives" ] && echo "No drives to unmount." &&  exit