[iOS] Fix after_prepare hook to run on multiple platforms so if they are added in one operation using `cordova prepare`, both platforms are processed. Fixes #221.
[iOS] Fix after_prepare hook to run on multiple platforms so if they are added in one operation using `cordova prepare`, both platforms are processed.
Fixes #221.

DigitalsunrayMedia/cordova-plugin-firebase,DigitalsunrayMedia/cordova-plugin-firebase,DigitalsunrayMedia/cordova-plugin-firebase