Removed unnecessary "rawNonce" from FirebasePlugin.m

[TheNotorius0]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation changes
• Other... Please describe:

PR Checklist

Please check your PR fulfills the following requirements:

Bugfixes:

• Regression testing has been carried out using the example project to ensure the intended bug is fixed and no regression bugs have been inadvertently introduced.

New features/enhancements:

• Exhaustive testing has been carried out for the new functionality
• Regression testing has been carried out to ensure no existing functionality is adversely affected
• Documentation has been added / updated
• The example project has been update to validate/demonstrate the new functionality.

What is the purpose of this PR?

Does this PR introduce a breaking change?

• Yes
• No

What testing has been done on the changes in the PR?

What testing has been done on existing functionality?

Other information

I had this pull request opened 6 months ago (#883) and unfortunately you merged a few days ago just when I was messing around with "rawNonce" on the Google Authentication for iOS, to test a few things.

You need this change, which basically reverts my pull request to the original state, otherwise the app crashes. The rawNonce is only used when logging in with Apple, as per the original pull request.