Fix generate_version_sql.bash to work properly when HAfAH is a submodule

Fix generate_version_sql.bash to work properly when HAfAH is a submodule

See https://gitlab.syncad.com/hive/haf_block_explorer/-/blob/721d0337b3fb0d0c840c186daf825a67be28a3c3/scripts/setup_db.sh#L82 for details.