fix: simplify edge-to-edge preference logic in CordovaActivity and SystemBarPlugin

[seamlink-aalves]

Simplify edge-to-edge preference logic

Platforms affected

Android

Motivation and Context

The motivation and context was described here: apache/cordova-discuss#114

When having cordova android in Edge To Edge the app does not extend to the full height of the device in version bellow Android 15. This change allows the app to behave the same way it was possible to do with the statusbar plugin preference StatusBarOverlaysWebView given that this stopped having any effect in cordova-android 15.

Description

This PR removes the limitation for Android version <15 when preference AndroidEdgeToEdge is true.

Testing

Tested in Android 12, 13 and 16

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