fix replicate first index gate issue

[fshahinfar1]

when the first gate of the replicate gates array is not zero the
behavior of the code was unexpected. it was emiting packets on
gate zero instead of using the gate in the array with zero index.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.96%. Comparing base (ab8773c) to head (f1dff7f).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1014   +/-   ##
=======================================
  Coverage   55.96%   55.96%           
=======================================
  Files           9        9           
  Lines        1165     1165           
=======================================
  Hits          652      652           
  Misses        513      513           

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