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/editor/src/display_map/wrap_map.rs

@@ -30,7 +30,7 @@ pub struct WrapMap {
 
 #[derive(Clone)]
 pub struct WrapSnapshot {
-    tab_snapshot: TabSnapshot,
+    pub(super) tab_snapshot: TabSnapshot,
     transforms: SumTree<Transform>,
     interpolated: bool,
 }