patch 8.1.0457: win32 console: key mappings don't work

Problem:    Win32 console: key mappings don't work.
Solution:   Use another solution for the keypad keys that doesn't break
            mappings. Some values will be negative. (Mike Williams)

src/version.c

@@ -792,6 +792,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    457,
 /**/
     456,
 /**/