fix(android): destroy webView to prevent memory leak

[jessyefuster]

Platforms affected

Android

Motivation and Context

Fixes https://github.com/apache/cordova-plugin-inappbrowser/issues/290

Description

Testing

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