Weapon switching doesn't work when switching back to default weapon

[jakub-pukovec]

When switching back to default weapon which already exists in inventory (RapidFire) from another weapon (e.g. IcePunch), the RapidFire weapon is not selected. Instead the other weapon (IcePunch) keeps to be selected.

Fix PR: https://github.com/gdquest-demos/godot-tours-101-the-godot-editor/pulls