[iOS] Added new InAppBrowserStatusBarStyle preference

[mosabab]

Platforms affected

iOS

Motivation and Context

InAppBrowserStatusBarStyle [iOS only]: (string, options 'lightcontent' or 'default'. Defaults to 'default') set text color style for iOS.

Description

According to new PR apache/cordova-plugin-inappbrowser#765 for InAppBrowser Plugin, users can now control the text color of statusbar style for InAppBrowser Plugin.
So this information added to config.xml documents.

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

[timbru31]

Thanks!