remove useless 'mut'

src/input.rs

@@ -12,7 +12,7 @@ pub fn get_host(config: &mut ConfigManager) -> Result<Host> {
     }
     
     let hosts = config.configs.to_owned();
-    let mut hosts: Vec<Host> = hosts.into_iter().collect();
+    let hosts: Vec<Host> = hosts.into_iter().collect();
     
     let theme = ColorfulTheme::default();
     let mut select = Select::with_theme(&theme);