cleanup: remove dead code lcd_adjust_z()

It's only used when MESH_BED_LEVELING is not defined. According to
the configuration files, all printers supported use MESH_BED_LEVELING.
So I think we are safe in removing this dead code.

Firmware/Marlin_main.cpp

@@ -2725,13 +2725,6 @@ static void gcode_G28(bool home_x_axis, long home_x_value, bool home_y_axis, lon
 
       clean_up_after_endstop_move(l_feedmultiply);
       endstops_hit_on_purpose();
-#ifndef MESH_BED_LEVELING
-//-// Oct 2019 :: this part of code is (from) now probably un-compilable
-      // If MESH_BED_LEVELING is not active, then it is the original Prusa i3.
-      // Offer the user to load the baby step value, which has been adjusted at the previous print session.
-      if(card.sdprinting && eeprom_read_word((uint16_t *)EEPROM_BABYSTEP_Z))
-          lcd_adjust_z();
-#endif
 
     // Load the machine correction matrix
     world2machine_initialize();

Firmware/ultralcd.cpp

@@ -2752,90 +2752,6 @@ void pid_extruder()
 	}
 
 }
-/*
-void lcd_adjust_z() {
-  int enc_dif = 0;
-  int cursor_pos = 1;
-  int fsm = 0;
-
-
-
-
-  lcd_clear();
-  lcd_set_cursor(0, 0);
-  lcd_puts_P(_n("Auto adjust Z?"));////MSG_ADJUSTZ
-  lcd_set_cursor(1, 1);
-  lcd_puts_P(_T(MSG_YES));
-
-  lcd_set_cursor(1, 2);
-
-  lcd_puts_P(_T(MSG_NO));
-
-  lcd_set_cursor(0, 1);
-
-  lcd_print('>');
-
-
-  enc_dif = lcd_encoder_diff;
-
-  while (fsm == 0) {
-
-    manage_heater();
-    manage_inactivity(true);
-
-    if ( abs((enc_dif - lcd_encoder_diff)) > 4 ) {
-
-      if ( (abs(enc_dif - lcd_encoder_diff)) > 1 ) {
-        if (enc_dif > lcd_encoder_diff ) {
-          cursor_pos --;
-        }
-
-        if (enc_dif < lcd_encoder_diff  ) {
-          cursor_pos ++;
-        }
-
-        if (cursor_pos > 2) {
-          cursor_pos = 2;
-        }
-
-        if (cursor_pos < 1) {
-          cursor_pos = 1;
-        }
-        lcd_set_cursor(0, 1);
-        lcd_print(' ');
-        lcd_set_cursor(0, 2);
-        lcd_print(' ');
-        lcd_set_cursor(0, cursor_pos);
-        lcd_print('>');
-        enc_dif = lcd_encoder_diff;
-        _delay(100);
-      }
-
-    }
-
-
-    if (lcd_clicked()) {
-      fsm = cursor_pos;
-      if (fsm == 1) {
-        int babystepLoadZ = 0;
-        babystepLoadZ = eeprom_read_word((uint16_t*)EEPROM_BABYSTEP_Z);
-        CRITICAL_SECTION_START
-        babystepsTodo[Z_AXIS] = babystepLoadZ;
-        CRITICAL_SECTION_END
-      } else {
-        int zero = 0;
-        eeprom_update_word((uint16_t*)EEPROM_BABYSTEP_X, zero);
-        eeprom_update_word((uint16_t*)EEPROM_BABYSTEP_Y, zero);
-        eeprom_update_word((uint16_t*)EEPROM_BABYSTEP_Z, zero);
-      }
-      _delay(500);
-    }
-  };
-
-  lcd_clear();
-  lcd_return_to_status();
-
-}*/
 
 #ifdef PINDA_THERMISTOR
 bool lcd_wait_for_pinda(float temp) {

Firmware/ultralcd.h

@@ -35,7 +35,6 @@ void lcd_setalertstatuspgm(const char* message, uint8_t severity = LCD_STATUS_AL
 uint8_t get_message_level();
 void lcd_reset_alert_level();
 
-void lcd_adjust_z();
 void lcd_pick_babystep();
 uint8_t lcd_alright();
 void show_preheat_nozzle_warning();