Don't fail to start up if lazy load check fails

Do the lazy loading check in the batch of things we do before
starting a sync rather than at client start time, so we don't fail
to start the client if we can't hit the HS to determine LL support.

Fixes https://github.com/vector-im/riot-web/issues/7455

src/errors.js

@@ -2,7 +2,7 @@
 // because of http://babeljs.io/docs/usage/caveats/#classes
 function InvalidStoreError(reason, value) {
     const message = `Store is invalid because ${reason}, ` +
-        `please delete all data and retry`;
+        `please stopthe client, delete all data and start the client again`;
     const instance = Reflect.construct(Error, [message]);
     Reflect.setPrototypeOf(instance, Reflect.getPrototypeOf(this));
     instance.reason = reason;