fix: warning about double short names
Description
Running clap_parses_user_defined_commands_as_expected  test, produces the following error:
```
Command make-it-rain: Short option names must be unique for each argument, but '-s' is in use by both 'start-amount' and 'stealth''
```
@@ -148,7 +148,7 @@ pub struct MakeItRainArgs {
pub start_time: Option<DateTime<Utc>>,
#[clap(short, long)]
pub one_sided: bool,
- #[clap(short, long, alias = "stealth-one-sided")]
+ #[clap(long, alias = "stealth-one-sided")]
pub stealth: bool,
#[clap(short, long, default_value = "Make it rain")]
pub message: String,
