package/babeld: unbreak download hash
Fixes https://autobuild.buildroot.org/results/9e35823ae09b8886c0fa193e903feb7bc69509a9/
Something went wrong when backporting commit 328a3b815d5a (package/babeld:
update URL site) and updating the download hash, the permissions were wrong
because of ACLs on the download directory leading to a wrong hash.
Fix that.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>