pre-commit: fix multiple file issue
pre-commit: fix multiple file issue

When using -z, you should always quote. If not, stuff like this happens:

	.git/hooks/pre-commit: line 10: [: too many arguments

fdroidtravis/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver