install-git-hooks.sh: Add missing -s to ln
install-git-hooks.sh: Add missing -s to ln

Broken in 9efd2db81ccf987a5455e0e4575c7d3f9072870f

Signed-off-by: Florian Pritz <753f544d2d01592750fb4bd29251b78abcfc8ecd@xinu.at>

Bluewind/filebin,Bluewind/filebin,Bluewind/filebin,Bluewind/filebin,Bluewind/filebin