Make bootstrap paths for data directory adhere to OpenBSD folder structure

Index: crates/registry/src/schema/structs_impl.rs
--- crates/registry/src/schema/structs_impl.rs.orig
+++ crates/registry/src/schema/structs_impl.rs
@@ -4100,7 +4100,7 @@ impl Default for Bootstrap {
             request_tls_certificate: true,
             generate_dkim_keys: true,
             data_store: DataStore::RocksDb(RocksDbStore {
-                path: "/var/lib/stalwart/".to_string(),
+                path: "/var/db/stalwart/".to_string(),
                 ..Default::default()
             }),
             blob_store: BlobStore::Default,
