refactor: remove new_simple methods and replace with new(None, None)

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/meta_plugin/hostname.rs

@@ -43,9 +43,6 @@ impl HostnameMetaPlugin {
         }
     }
     
-    pub fn new_simple() -> HostnameMetaPlugin {
-        Self::new(None, None)
-    }
     
     fn get_hostname(&self) -> String {
         // First get the short hostname