perf(trie): preserve allocations in sparse trie wipe() (#21089)

crates/trie/sparse/src/parallel.rs

@@ -3045,7 +3045,8 @@ impl SparseSubtrie {
     /// Removes all nodes and values from the subtrie, resetting it to a blank state
     /// with only an empty root node. This is used when a storage root is deleted.
     fn wipe(&mut self) {
-        self.nodes = HashMap::from_iter([(Nibbles::default(), SparseNode::Empty)]);
+        self.nodes.clear();
+        self.nodes.insert(Nibbles::default(), SparseNode::Empty);
         self.inner.clear();
     }