Remove switch case fallthrough

[rempas]

On Thursday, 13 May 2021 at 14:15:15 UTC, Steven Schveighoffer 
wrote:
> On 5/13/21 9:28 AM, rempas wrote:
>> [...]
>
> It's already deprecated, since 2.072. It's also been a warning 
> since 2.054. I'm not sure if this is intended to be removed or 
> not, but removing it today would put it at a 4.5 year 
> deprecation period, and 10 years since it's been a warning.
>
>> [...]
>
> Nobody thinks case fallthrough is good, this is why it's a 
> warning and deprecated.
>
> -Steve

My mistake for not being clear, like I said to the other 
comments, I mean that we should not need the "break" anymore.