Simplify logic in ArgFileBuilder

[ascopes]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.65%. Comparing base (93cc667) to head (c1cf94f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #413   +/-   ##
=======================================
  Coverage   87.65%   87.65%           
=======================================
  Files          33       33           
  Lines        1117     1117           
  Branches       74       75    +1     
=======================================
  Hits          979      979           
  Misses        104      104           
  Partials       34       34           

Files with missing lines	Coverage Δ
...protobufmavenplugin/plugins/JvmPluginResolver.java	84.40% <100.00%> (-0.10%)	⬇️
...protobufmavenplugin/utils/ArgumentFileBuilder.java	100.00% <100.00%> (ø)