Fix and improve LCD value editing display

- Fix: When "100.0" changes to "99.0" the LCD shows "199.0"
- Use 2 rows if needed on character LCD, (allowing longer labels…
Germany, et. al.)
- Known issue: A certain length label combined with a certain value
drawing function could, for example, display 99.0 on 1 line, but 100.0
on two lines. Workaround would be to pass a nominal value size argument.

Marlin/ultralcd_impl_HD44780.h

@@ -978,7 +978,9 @@ static void lcd_implementation_status_screen() {
     lcd_printPGM(pstr);
     if (value != NULL) {
       lcd.print(':');
-      lcd.setCursor(LCD_WIDTH - lcd_strlen(value), 1);
+      const uint8_t valrow = (lcd_strlen_P(pstr) + 1 + lcd_strlen(value) + 1) > (LCD_WIDTH - 2) ? 2 : 1;  // Value on the next row if it won't fit
+      lcd.setCursor((LCD_WIDTH - 1) - (lcd_strlen(value) + 1), valrow);                                   // Right-justified, padded by spaces
+      lcd.print(' ');                                                                                     // overwrite char if value gets shorter
       lcd_print(value);
     }
   }