Fix assigned boot nodes port number in genesis

[Stefan-Ethernal]

Description

This PR fixes bootnodes port assignment changed through #912, which was wrong, because it assigned port numbers greater than 65536.

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

[codecov]

Codecov Report

Merging #930 (f08b185) into feature/v3-parity (8627f12) will increase coverage by 0.01%.
The diff coverage is n/a.

@@                  Coverage Diff                  @@
##           feature/v3-parity     #930      +/-   ##
=====================================================
+ Coverage              53.77%   53.79%   +0.01%     
=====================================================
  Files                    162      162              
  Lines                  21676    21676              
=====================================================
+ Hits                   11657    11660       +3     
+ Misses                  9059     9057       -2     
+ Partials                 960      959       -1     

Impacted Files	Coverage Δ
syncer/client.go	63.20% <0.00%> (+1.41%)	⬆️

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