fix(icon): fork without original process args

[1ed]

When we start the server e.g. with --inspect and forking it
with the default process.execArgv it will cause an error,
because it wants to start the inspector again on the same port.

This patch fixes this issue.

Related to #218

[codecov]

Codecov Report

Merging #343 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #343   +/-   ##
=======================================
  Coverage   85.43%   85.43%           
=======================================
  Files          10       10           
  Lines         357      357           
  Branches      108      108           
=======================================
  Hits          305      305           
  Misses         48       48           
  Partials        4        4           

Impacted Files	Coverage Δ
lib/icon/module.js	93.33% <100.00%> (ø)

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[pi0]

Thanks 💯