Adjust the Z display to hide float rounding errors

Marlin/ultralcd_implementation_hitachi_HD44780.h

 # endif//LCD_WIDTH > 19
     lcd.setCursor(LCD_WIDTH - 8, 1);
     lcd.print('Z');
-    lcd.print(ftostr32(current_position[Z_AXIS]));
+    lcd.print(ftostr32(current_position[Z_AXIS] + 0.00001));
 #endif//LCD_HEIGHT > 2
 
 #if LCD_HEIGHT > 3