Remove unused MSG_OK_B and MSG_OK_T

Marlin/configurator/config/language.h

 #define MSG_KP                              " Kp: "
 #define MSG_KI                              " Ki: "
 #define MSG_KD                              " Kd: "
-#define MSG_OK_B                            "ok B:"
-#define MSG_OK_T                            "ok T:"
 #define MSG_AT                              " @:"
 #define MSG_PID_AUTOTUNE_FINISHED           MSG_PID_AUTOTUNE " finished! Put the last Kp, Ki and Kd constants from below into Configuration.h"
 #define MSG_PID_DEBUG                       " PID_DEBUG "