(iOS) Fix two compile-time type warnings and simplify code by using auto boxing of NSNumber.

[PlanetaryCode]

Platforms affected

iOS

Motivation and Context

I hate disregarded warnings at compile time.

Description

Existing code was converting to NSNumber with wrong init method for the type.
Rather than change the method called I switched to auto boxing the values which automatically does the right thing in less code.

Testing

Ran npm test

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-io]

Codecov Report

Merging #825 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #825   +/-   ##
=======================================
  Coverage   74.20%   74.20%           
=======================================
  Files          13       13           
  Lines        1849     1849           
=======================================
  Hits         1372     1372           
  Misses        477      477           

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[dpogue]

👍