Remove redundant attribute #[states(scoped_entities)] from examples.

[swoobie]

The default behavior for state scoped entities was changed to an opt-out, instead of opt-in during the migration from 0.16 to 0.17. These examples are still using the attribute as an explicit opt-in.

See: https://bevy.org/learn/migration-guides/0-16-to-0-17/#state-scoped-entities-are-now-always-enabled-implicitly

Objective

• Tidy up State examples using the implicitly enabled attribute with an explicit declaration.

Solution

• Remove #[states(scoped_entities)] attribute line for States used in the examples.

Testing

• Did you test these changes? If so, how?

Tested the examples locally with these CLI commands:

1. cargo run --color=always --package bevy --example testbed_ui --profile dev
2. cargo run --color=always --package bevy --example sub_states --profile dev --features=bevy_dev_tools

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