web: fix typings reference

Author: TorstenDittmann

templates/web/package.json.twig

@@ -13,7 +13,7 @@
     "./package.json": "./package.json"
   },
   "module": "dist/esm/sdk.js",
-  "types": "types/sdk.d.ts",
+  "types": "types/index.d.ts",
   "repository": {
     "type": "git",
     "url": "{{ sdk.gitURL }}"