multi_buffer: Remove redundant buffer id field (#43459)

It is easy for us to get the two fields out of sync causing weird
problems, there is no reason to have both here so.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Co-authored by: Antonio Scandurra <antonio@zed.dev>

crates/project/src/project.rs

@@ -4002,7 +4002,8 @@ impl Project {
     ) -> Task<anyhow::Result<Vec<InlayHint>>> {
         let snapshot = buffer_handle.read(cx).snapshot();
 
-        let captures = snapshot.debug_variables_query(Anchor::MIN..range.end);
+        let captures =
+            snapshot.debug_variables_query(Anchor::min_for_buffer(snapshot.remote_id())..range.end);
 
         let row = snapshot
             .summary_for_anchor::<text::PointUtf16>(&range.end)