Neuronmonitor declaration in CONFIG state -- fix message saying config or setup

[hkashyap]

In carlsim/interface/src/carlsim.cpp

UserErrors::assertTrue(carlsimState_ == CONFIG_STATE,
UserErrors::CAN_ONLY_BE_CALLED_IN_STATE, funcName, funcName, "CONFIG or SETUP.");
should be changed to:
UserErrors::assertTrue(carlsimState_ == CONFIG_STATE,
UserErrors::CAN_ONLY_BE_CALLED_IN_STATE, funcName, funcName, "CONIG.");