One more space on a short status message

Marlin/ultralcd.cpp

@@ -4393,11 +4393,11 @@ void pad_message_string() {
     // pad with spaces to fill up the line
     while (j++ < LCD_WIDTH) lcd_status_message[i++] = ' ';
     // chop off at the edge
-    lcd_status_message[--i] = '\0';
+    lcd_status_message[i] = '\0';
   }
 }
 
-void lcd_finishstatus(bool persist=false) {
+void lcd_finishstatus(const bool persist=false) {
 
   pad_message_string();