fix: duplicated android folder on create flutter_plugin

[erickzanardo]

Description
When creating a new flutter plugin, the _android folder gets duplicated in two different places, one is on the root folder (which is the correct place) and another one is on the app-facing package.

Steps To Reproduce

1. Run very_good create -t flutter_plugin bla
2. Check the root folder, there will be a bla_android
3. Enter the bla folder, there will another bla_android here

Expected Behavior
The app-facing package shouldn't contain an android folder

[felangel]

This should be resolved in v0.4.17 🎉