message: Reduce probable size to 1G
diff: static const uint64_t GB_BYTES = 1000000000LL;
  /* Minimum free space (in GB) needed for data directory */
  -static const uint64_t BLOCK_CHAIN_SIZE = 10;
  +static const uint64_t BLOCK_CHAIN_SIZE = 1;
  /* Minimum free space (in GB) needed for data directory when pruned; Does not include prune target */
  -static const uint64_t CHAIN_STATE_SIZE = 2;
  +static const uint64_t CHAIN_STATE_SIZE = 1;
  /* Total required space (in GB) depending on user choice (prune, not prune) */
  static uint64_t requiredSpace;
  