Remove duplicated code for unchanged parts of different extension API versions (#10218)

Release Notes:

- N/A

---------

Co-authored-by: Marshall <marshall@zed.dev>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/extension_api/src/settings.rs

@@ -1,5 +1,5 @@
 #[path = "../wit/since_v0.0.6/settings.rs"]
-pub mod types;
+mod types;
 
 use crate::{wit, Result, SettingsLocation, Worktree};
 use serde_json;