advertise esc_status where is publishes

- esc_status is an optional logging topic resulting in it not being
logged if it doesn't get advertise -> Add advertise where applicable

src/modules/simulation/gz_bridge/GZMixingInterfaceESC.cpp

@@ -53,6 +53,8 @@ bool GZMixingInterfaceESC::init(const std::string &model_name)
 		return false;
 	}
 
+	_esc_status_pub.advertise();
+
 	ScheduleNow();
 
 	return true;

src/modules/simulation/simulator_mavlink/SimulatorMavlink.cpp

@@ -96,6 +96,8 @@ SimulatorMavlink::SimulatorMavlink() :
 		snprintf(param_name, sizeof(param_name), "%s_%s%d", "PWM_MAIN", "FUNC", i + 1);
 		param_get(param_find(param_name), &_output_functions[i]);
 	}
+
+	_esc_status_pub.advertise();
 }
 
 void SimulatorMavlink::parameters_update(bool force)