* Fixing issue that prevented the wakunode2 from starting
The issue was introduced in PR#1818.
Before this commit, the `wakunode2` app crashed with the next error:
ERR 2023-06-27 15:57:27.268+00:00 5/7 Starting node and protocols failed
topics="wakunode main" tid=1 file=wakunode2.nim:92 error="failed to
start waku discovery v5: "
* fix tests accordingly
* publisher.nim, subscriber.nim: fix