remove MnemoConf::new

src/config.rs

@@ -20,9 +20,6 @@ pub struct MnemoConf {
 }
 
 impl MnemoConf {
-    pub fn new() -> Self {
-        MnemoConf::default()
-    }
     pub async fn load(conn: &mut sqlx::PgConnection) -> Result<Self, sqlx::Error> {
         let row: Option<serde_json::Value> =
             sqlx::query_scalar("SELECT config FROM mnemoconf LIMIT 1")