test: wait also for second dht in test to pass before doing the checks

[rach-id]

Overview

This should fix a test that fails from time to time because the test isn't waiting for the second DHT routing table to populate:
https://github.com/celestiaorg/orchestrator-relayer/actions/runs/4773521264/jobs/8486641970

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #307 (ef79d55) into main (bdfe030) will increase coverage by 0.20%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #307      +/-   ##
==========================================
+ Coverage   43.39%   43.59%   +0.20%     
==========================================
  Files          26       26              
  Lines        1991     1991              
==========================================
+ Hits          864      868       +4     
+ Misses       1005     1002       -3     
+ Partials      122      121       -1     

see 1 file with indirect coverage changes

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