ignore trailing slashes for comparison of source

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

cdist/conf/type/__link/explorer/state

@@ -35,7 +35,8 @@ case "$type" in
       cd "$destination_dir"
       source_is=$(ls -l "$destination" | sed 's/.*-> //g')
       if [ -h "$destination" ]; then
-         if [ "$source_is" = "$source" ]; then
+         # ignore trailing slashes for comparison
+         if [ "${source_is%/}" = "${source%/}" ]; then
             echo present
          else
             echo wrongsource