Fix SCYLLA-VERSION-GEN permissions
Fix SCYLLA-VERSION-GEN permissions

Commit 434ce947b09a07dea0733858926a1fa22b761dc7 ("Code formatting + source
cleanup (eclipse)") changed permissions of SCYLLA-VERSION-GEN for no reason.
Fix them up.

scylladb/scylla-jmx,scylladb/scylla-jmx,scylladb/scylla-jmx