Apply suggestion from @maxtropets

Author: maxtropets

src/node/snapshot_serdes.h

@@ -209,7 +209,7 @@ namespace ccf
 
     auto rc = store->deserialise_snapshot(
       snapshot.data(),
-      segments.header_and_body.size(),
+      snapshot.size(),
       hooks,
       view_history,
       public_only);