message: [RPC][BUG] Fix ActivateBestChain calls in reconsider(invalidate)block
  The third argument of ABC should be `fAlreadyChecked` (defaulted to
  false).
  In reconsiderblock and invalidateblock RPC, `g_connman.get()` (which can
  be automatically cast to bool) is improperly added as third (instead of
  fourth) argument.
diff: @@ -1133,7 +1133,7 @@ UniValue invalidateblock(const JSONRPCRequest& request)
  }
  if (state.IsValid()) {
  - ActivateBestChain(state, NULL, g_connman.get());
  + ActivateBestChain(state, nullptr, false, g_connman.get());
  }
  if (!state.IsValid()) {
  @@ -1171,7 +1171,7 @@ UniValue reconsiderblock(const JSONRPCRequest& request)
  }
  if (state.IsValid()) {
  - ActivateBestChain(state, NULL, g_connman.get());
  + ActivateBestChain(state, nullptr, false, g_connman.get());
  }
  if (!state.IsValid()) {
  