fix(api): keep leading dots after the beginning * is removed

[favonia]

This is to handle some obscure corner cases that probably never show up in reality. Previously, for the domain *....a.com the tool will immediately try a.com and com and so on. Now it would try ...a.com, ..a.com, and .a.com before a.com and com.

[codecov]

Codecov Report

Merging #97 (574dc70) into main (09f4dfe) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #97   +/-   ##
=======================================
  Coverage   78.63%   78.63%           
=======================================
  Files          24       24           
  Lines        1212     1212           
=======================================
  Hits          953      953           
  Misses        255      255           
  Partials        4        4           

Flag	Coverage Δ
unittests	78.63% <100.00%> (ø)

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Impacted Files	Coverage Δ
internal/api/domain.go	100.00% <100.00%> (ø)

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