Fix more panics when removing excerpts (#28836)

Release Notes:

- Fixed a panic when an excerpt removed has an edit suggestion inlay in
it

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/multi_buffer/src/anchor.rs

@@ -71,7 +71,7 @@ impl Anchor {
         if self_excerpt_id == ExcerptId::min() || self_excerpt_id == ExcerptId::max() {
             return Ordering::Equal;
         }
-        if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
+        if let Some(excerpt) = snapshot.excerpt(self_excerpt_id) {
             let text_cmp = self.text_anchor.cmp(&other.text_anchor, &excerpt.buffer);
             if text_cmp.is_ne() {
                 return text_cmp;

crates/multi_buffer/src/multi_buffer.rs

@@ -6041,7 +6041,7 @@ impl MultiBufferSnapshot {
                     return &entry.locator;
                 }
             }
-            panic!("invalid excerpt id {:?}", id)
+            panic!("invalid excerpt id {id:?}")
         }
     }