refactor: drop redundant int64 in newrandomgenerator

[Goodnight77]

description:

remove redundant int64(seed) cast in NewRandomGenerator
seed is already int64 from the function signature

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.91%. Comparing base (1dac895) to head (4cce766).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1256      +/-   ##
==========================================
- Coverage   72.95%   72.91%   -0.04%     
==========================================
  Files          91       91              
  Lines       16720    16720              
==========================================
- Hits        12198    12192       -6     
- Misses       3278     3283       +5     
- Partials     1244     1245       +1     

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