fix: support installing platfrom from local git clone

[erisu]

Motivation and Context

Ability to install platfrom from local git clone

Description

If require.resolve fails to resolvecordova-android, it is coming from local dir..

Testing

npm t
cordova build
cordova create
cordova platform add

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

Merging #1453 (c721dbd) into master (861fec2) will decrease coverage by 0.16%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1453      +/-   ##
==========================================
- Coverage   72.41%   72.25%   -0.17%     
==========================================
  Files          21       21              
  Lines        1744     1748       +4     
==========================================
  Hits         1263     1263              
- Misses        481      485       +4     

Impacted Files	Coverage Δ
lib/prepare.js	46.63% <0.00%> (-0.47%)	⬇️

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[NiklasMerz]

Installing the platform with a relative path works and the code looks better to read-