Remove duplicate method definition
Remove duplicate method definition

no_color! is already defined in [`Rails::Command::Behavior`][behavior],
which gets [included into `Rails:Generators`][include]. This duplication
came about in 6813edc7d9 when we introduced the Thor command structure.

We have [test coverage][] to ensure this method still behaves correctly
on `Rails:Generators`.

[behavior]: https://github.com/rails/rails/blob/f7e91c7224560fbd3e95c238a0e8bb362799bcb7/railties/lib/rails/command/behavior.rb#L12-L14
[include]: https://github.com/rails/rails/blob/f7e91c7224560fbd3e95c238a0e8bb362799bcb7/railties/lib/rails/generators.rb#L18
[test coverage]: https://github.com/rails/rails/blob/f7e91c7224560fbd3e95c238a0e8bb362799bcb7/railties/test/generators_test.rb#L163-L168

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