Update index.d.ts

Author: tomayac

index.d.ts

@@ -180,7 +180,7 @@ declare module '@sqlite.org/sqlite-wasm' {
   };
 
   export default function sqlite3InitModule(
-    opts: InitOptions,
+    opts?: InitOptions,
   ): Promise<Sqlite3Static>;
 
   // generated by Object.keys(sqlite3.capi).map(k => `${k}: any;`).join('\n')