message: fixes m_assumed_blockchain_size variables values:
  This commit was a fix to `m_assumed_blockchain_size` reverted from
  3fc2063's 220 to 9d0e528's 200 since work on was being done in
  parallel and ended up reverting `m_assumed_blockchain_size`.
  This commits is now a intended to be a bump of
  `m_assumed_blockchain_size` for both mainnet and testnet for new
  reasonable values.
diff: @@ -107,7 +107,7 @@ public:
  pchMessageStart[3] = 0xd9;
  nDefaultPort = 8333;
  nPruneAfterHeight = 100000;
  - m_assumed_blockchain_size = 200;
  + m_assumed_blockchain_size = 240;
  m_assumed_chain_state_size = 3;
  genesis = CreateGenesisBlock(1231006505, 2083236893, 0x1d00ffff, 1, 50 * COIN);
  @@ -219,7 +219,7 @@ public:
  pchMessageStart[3] = 0x07;
  nDefaultPort = 18333;
  nPruneAfterHeight = 1000;
  - m_assumed_blockchain_size = 20;
  + m_assumed_blockchain_size = 30;
  m_assumed_chain_state_size = 2;
  genesis = CreateGenesisBlock(1296688602, 414098458, 0x1d00ffff, 1, 50 * COIN);
  