chore(addBuildPhase): remove unused variable buildPhaseSection

[erisu]

Remove unused variable buildPhaseSection in the addBuildPhase.

This variable appears to have been left behind during the refactoring in this commit, prior to this code base being contributed: alunny/node-xcode@8b3c7f6

The current implementation still appears to preserve the original logic:

if (!this.hash.project.objects[buildPhaseType]) {
    this.hash.project.objects[buildPhaseType] = {};
}

if (!this.hash.project.objects[buildPhaseType][buildPhaseUuid]) {
    this.hash.project.objects[buildPhaseType][buildPhaseUuid] = buildPhase;
    this.hash.project.objects[buildPhaseType][commentKey] = comment;
}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.36%. Comparing base (81ddc4a) to head (329bd0b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #175      +/-   ##
==========================================
+ Coverage   97.34%   97.36%   +0.02%     
==========================================
  Files          51       51              
  Lines       11058    11052       -6     
==========================================
- Hits        10764    10761       -3     
+ Misses        294      291       -3     

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