Remove trailing slash from path if necessary

prefill.sh

@@ -1,4 +1,7 @@
 #!/bin/bash
+# Remove trailing slash in statedir if necessary.
+_statedir="`echo "$statedir" | sed -s 's/\/$//g'`"
+statedir="$_statedir"
 # Watch a file and push the string `kitty-launch` to the device listed in the
 # file if it is ever modified. 
 while true; do