Bugfix: init: For first-run disk space check, advise user of correct pruned size rather than full blockchain size

src/init.cpp

@@ -1726,7 +1726,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
                     "Approximately %u GB of data will be stored in this directory."
                 ),
                 fs::quoted(fs::PathToString(args.GetBlocksDirPath())),
-                chainparams.AssumedBlockchainSize()
+                additional_bytes_needed / 1'000'000'000
             ));
         }
     }