Fix G34 Z lower, extra "BLTOUCH" debug line (#17175)

Marlin/src/core/utility.cpp

@@ -67,7 +67,6 @@ void safe_delay(millis_t ms) {
       TERN(PROBE_MANUALLY, "PROBE_MANUALLY", "")
       TERN(NOZZLE_AS_PROBE, "NOZZLE_AS_PROBE", "")
       TERN(FIX_MOUNTED_PROBE, "FIX_MOUNTED_PROBE", "")
-      TERN(BLTOUCH, "BLTOUCH", "")
       TERN(HAS_Z_SERVO_PROBE, TERN(BLTOUCH, "BLTOUCH", "SERVO PROBE"), "")
       TERN(TOUCH_MI_PROBE, "TOUCH_MI_PROBE", "")
       TERN(Z_PROBE_SLED, "Z_PROBE_SLED", "")

Marlin/src/gcode/calibrate/G34_M422.cpp

@@ -203,7 +203,7 @@ void GcodeSuite::G34() {
         const uint8_t iprobe = (iteration & 1) ? NUM_Z_STEPPER_DRIVERS - 1 - i : i;
 
         // Safe clearance even on an incline
-        if (iteration == 0 || i > 0) do_blocking_move_to_z(z_probe);
+        if ((iteration == 0 || i > 0) && z_probe > current_position.z) do_blocking_move_to_z(z_probe);
 
         if (DEBUGGING(LEVELING))
           DEBUG_ECHOLNPAIR_P(PSTR("Probing X"), z_stepper_align.xy[iprobe].x, SP_Y_STR, z_stepper_align.xy[iprobe].y);