cnf: Quote the arguments passed to pk-command-not-found

"$@" is a special variable in bash that expands to all the positional
parameters properly quoted. Essentially it means that any parameters
with spaces will be passed correctly as a single argument.

Signed-off-by: Richard Hughes <richard@hughsie.com>

contrib/command-not-found/PackageKit.sh.in

@@ -18,7 +18,7 @@ command_not_found_handle () {
 
 	# run the command, or just print a warning
 	if [ $runcnf -eq 1 ]; then
-		@LIBEXECDIR@/pk-command-not-found $@
+		@LIBEXECDIR@/pk-command-not-found "$@"
 		retval=$?
 	else
 		echo "bash: $1: command not found"