aio app pack fixes

[moritzraho]

Description

fix for https://github.com/adobe/aio-cli-plugin-app/issues/697

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #702 (d17c009) into master (a7189d4) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #702   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        57           
  Lines         3152      3167   +15     
  Branches       589       596    +7     
=========================================
+ Hits          3152      3167   +15     

Files Changed	Coverage Δ
src/commands/app/pack.js	100.00% <100.00%> (ø)

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