[era_dump (rust)] Dump the current_writeset that has not been archived

This patch is added in corresponding to the dm-era patch de89afc1 in kernel:
dm era: Recover committed writeset after crash

src/era/dump.rs

@@ -277,9 +277,7 @@ pub fn dump_metadata(
     };
     out.superblock_b(&xml_sb)?;
 
-    let mut path = vec![0];
-    let writesets =
-        btree_to_map::<Writeset>(&mut path, engine.clone(), repair, sb.writeset_tree_root)?;
+    let writesets = get_writesets_ordered(engine.clone(), sb, repair)?;
     for (era, ws) in writesets.iter() {
         dump_writeset(engine.clone(), out, *era as u32, ws, repair)?;
     }