Remove a redundant ?: in the nethack_keypad code.

I think all of the cases in this switch must have originally said
(shift_state ? 'this' : 'that'), and in all but the VK_NUMPAD5 case
the two options were different, and I left VK_NUMPAD5 containing a
redundant ?: just to make it line up in a nice table with the others.
But now the others all have more options than that because I had to
support Ctrl as well as Shift modifiers, so there's no reason to have
that silly ?: lingering around (and it annoys Coverity).

windows/window.c

@@ -4249,7 +4249,7 @@ static int TranslateKey(UINT message, WPARAM wParam, LPARAM lParam,
 		*p++ = "hH\010\010"[shift_state & 3];
 		return p - output;
 	      case VK_NUMPAD5:
-		*p++ = shift_state ? '.' : '.';
+		*p++ = '.';
 		return p - output;
 	      case VK_NUMPAD6:
 		*p++ = "lL\014\014"[shift_state & 3];