Update Marlin/ultralcd_implementation_hitachi_HD44780.h

Fix to a bug that I just introduced - sorry. Forgot about offset of string length.

Marlin/ultralcd_implementation_hitachi_HD44780.h

@@ -321,9 +321,9 @@ static void lcd_implementation_drawmenu_setting_edit_generic(uint8_t row, const
     char c;
     //Use all characters in narrow LCDs
   #if LCD_WIDTH < 20
-    	uint8_t n = LCD_WIDTH - 1 - 1;
+    	uint8_t n = LCD_WIDTH - 1 - 1 - strlen(data);
     #else
-    	uint8_t n = LCD_WIDTH - 1 - 2;
+    	uint8_t n = LCD_WIDTH - 1 - 2 - strlen(data);
   #endif
     lcd.setCursor(0, row);
     lcd.print(pre_char);
@@ -343,9 +343,9 @@ static void lcd_implementation_drawmenu_setting_edit_generic_P(uint8_t row, cons
     char c;
     //Use all characters in narrow LCDs
   #if LCD_WIDTH < 20
-    	uint8_t n = LCD_WIDTH - 1 - 1;
+    	uint8_t n = LCD_WIDTH - 1 - 1 - strlen_P(data);
     #else
-    	uint8_t n = LCD_WIDTH - 1 - 2;
+    	uint8_t n = LCD_WIDTH - 1 - 2 - strlen_P(data);
   #endif
     lcd.setCursor(0, row);
     lcd.print(pre_char);