editor: Shrink DisplayMapSnapshot from 824 to 256 bytes (#39568)

We have unnecessary clones for the fields here as most of the snapshots
contain the others hierarchically.

Release Notes:

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

crates/language_tools/src/syntax_tree_view.rs

@@ -255,7 +255,7 @@ impl SyntaxTreeView {
             let selection_range = editor.selections.last::<usize>(cx).range();
             let multi_buffer = editor.buffer().read(cx);
             let (buffer, range, excerpt_id) = snapshot
-                .buffer_snapshot
+                .buffer_snapshot()
                 .range_to_buffer_ranges(selection_range)
                 .pop()?;
             let buffer = multi_buffer.buffer(buffer.remote_id()).unwrap();