Make genesis format compatible with different polkadot versions

(cherry picked from commit 59ded148)

src/genesis/genesis.ts

@@ -89,7 +89,9 @@ export async function saveGenesis(ctx: Ctx, block: Block) {
   ctx.log.info("Loading genesis");
 
   // Read genesis json
-  const genesis: Genesis = JSON.parse(readFileSync(path.resolve(genesis_path)).toString()).genesis.runtimeAndCode.runtime;
+  const genesisData = JSON.parse(readFileSync(path.resolve(process.cwd(), genesis_path)).toString());
+  // Accomodate for versions of polkadot before and after 1.6.0:
+  const genesis: Genesis = genesisData.genesis.runtimeAndCode?.runtime || genesisData.genesis.runtimeGenesis.patch;
 
   const accounts: Map<Address, Account> = new Map();
   const identities: Map<IdtyIndex, Identity> = new Map();