Cache buster failing for expired shape handles

This is a follow-up to the bug fixed in this pr: https://github.com/electric-sql/electric/pull/3701

**Versions**

- Client: typescript
- Electric: latest

**Bug description**
The fix for https://github.com/electric-sql/electric/pull/3701 is failing to update the cache buster url param on each subsequent retry, yielding the same failure repeating itself.

**Expected behavior**
When the client finds itself in a broken state, and attempts to use the cache-buster url param, it should change that param between requests.