fix typo in load.sh.tpl

[kopp]

Currently the generated template looks like

if [ -e "$LOADER}" ]; then
    CONTAINER_CLI="$LOADER"
elif command -v docker &> /dev/null; then
    CONTAINER_CLI="docker"
# ...

This will never evaluate the first if clause, because $LOADER} will for an empty LOADER expand to }.

[kopp]

@thesayyn could you please have a brief look at this super-mini PR? :)

[thesayyn]

Hmm, this seems to be failing. i guess we need to check if the loader is a file.