Rover: PM log message more consistent with Plane

APMrover2/Log.cpp

@@ -345,7 +345,7 @@ void Rover::Log_Write_WheelEncoder()
 const LogStructure Rover::log_structure[] = {
     LOG_COMMON_STRUCTURES,
     { LOG_PERFORMANCE_MSG, sizeof(log_Performance),
-      "PM",  "QIHIhhhBHI", "TimeUS,LTime,MLC,gDt,GDx,GDy,GDz,I2CErr,INSErr,Mem", "ss-------b", "FC-------0" },
+      "PM",  "QIHIhhhBHI", "TimeUS,LTime,NLoop,MaxT,GDx,GDy,GDz,I2CErr,INSErr,Mem", "ss-------b", "FC-------0" },
     { LOG_STARTUP_MSG, sizeof(log_Startup),
       "STRT", "QBH",        "TimeUS,SType,CTot", "s--", "F--" },
     { LOG_THR_MSG, sizeof(log_Throttle),