Put fixed multiaddr into peerstore

[gammazero]

Need to store the fixed multiaddr, with the p2p peer ID removed, in the peerstore. This is a follow-up to #1160

[codecov-commenter]

Codecov Report

Base: 54.25% // Head: 54.25% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (fc84d05) compared to base (95e814e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1168   +/-   ##
=======================================
  Coverage   54.25%   54.25%           
=======================================
  Files         149      149           
  Lines       14810    14811    +1     
=======================================
+ Hits         8035     8036    +1     
  Misses       5900     5900           
  Partials      875      875           

Impacted Files	Coverage Δ
dagsync/subscriber.go	85.32% <100.00%> (+0.02%)	⬆️

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