core/state/snapshot, ethdb: track deletions more accurately (#22582)

* core/state/snapshot, ethdb: track deletions more accurately

* core/state/snapshot: don't reset the iterator, leveldb's screwy

* ethdb: don't mess with the insert batches for now

ethdb/leveldb/leveldb.go

@@ -461,7 +461,7 @@ func (b *batch) Put(key, value []byte) error {
 // Delete inserts the a key removal into the batch for later committing.
 func (b *batch) Delete(key []byte) error {
 	b.b.Delete(key)
-	b.size++
+	b.size += len(key)
 	return nil
 }