paras: fix upgrade restriction signal (#4603)
Closes #3971 Read the linked issue. Apart from that, this addresses the concern raised in this [comment] by just adding a test. I couldn't find a clean way to reconcile a block number delay with a PVF voting TTL, so I just resorted to rely on the test. Should be fine for now. [comment]: https://github.com/paritytech/polkadot/pull/4457#discussion_r770517562
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