chore: remove verbose debug log

[Cherry]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

This simply removes a debug log that crept in here: https://github.com/webpack-contrib/terser-webpack-plugin/pull/373/files#diff-bfe9874d239014961b1ae4e89875a6155667db834a410aaaa2ebe3cf89820556R214

Breaking Changes

None

[codecov]

Codecov Report

Merging #374 (5c2c7cc) into master (1859a92) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
- Coverage   97.00%   96.98%   -0.02%     
==========================================
  Files           3        3              
  Lines         300      299       -1     
  Branches      128      128              
==========================================
- Hits          291      290       -1     
  Misses          8        8              
  Partials        1        1              

Impacted Files	Coverage Δ
src/index.js	97.59% <ø> (-0.02%)	⬇️

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[alexander-akait]

Thanks