fix: missed one hardcoded /sbin in sysvinit script

accidentally missed one full path specifier in previous commit, intended
to make all invocations occur via $PATH (there was an embedded call to
cgproxy in cgmanager's init script)

config/init/sysvinit/cgmanager

@@ -79,7 +79,7 @@ do_start()
 	# Kill any existing cgproxy
 	/etc/init.d/cgproxy stop >/dev/null 2>&1 || true
 	# check whether to start cgproxy or cgmanager
-	if /sbin/cgproxy --check-master; then
+	if cgproxy --check-master; then
 		NESTED=yes /etc/init.d/cgproxy start || true && { exit 0; }
 	fi