Run prepare with the correct ConfigParser version

[dpogue]

Platforms affected

ios

Motivation and Context

See #535: The ConfigParser passed in by cordova-lib is constructed from the cordova-common version that cordova-lib is using, rather than the one that cordova-ios is using.

Description

Initialize the ConfigParser at the platform API level so that it uses the expected version.

Testing

All unit tests pass.

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)

[erisu]

LGTM

[codecov-io]

Codecov Report

Merging #573 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #573      +/-   ##
==========================================
+ Coverage   74.57%   74.58%   +0.01%     
==========================================
  Files          11       11              
  Lines        1825     1826       +1     
==========================================
+ Hits         1361     1362       +1     
  Misses        464      464

Impacted Files	Coverage Δ
bin/templates/scripts/cordova/Api.js	70.56% <100%> (+0.1%)	⬆️

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