Validation error message for session name shows incorrect character limit

[OliveiraNt]

When trying to start a session with a name that is too long, Zellij returns the following error message:

session name must be less than 0 characters

This message is confusing and incorrect. It happens when the session name causes the resulting socket path to exceed the maximum allowed length, but the displayed number of allowed characters ends up being zero.

zellij/zellij-utils/src/cli.rs

Line 27 in 226f5dc

"session name must be less than {} characters",

 if socket_path.as_os_str().len() >= ZELLIJ_SOCK_MAX_LENGTH {
            // socket path must be less than 108 bytes
            let available_length = ZELLIJ_SOCK_MAX_LENGTH
                .saturating_sub(socket_path.as_os_str().len())
                .saturating_sub(1);

            return Err(format!(
                "session name must be less than {} characters",
                available_length
            ));
        };
    };