Add KMOD_SCROLL

Author: Free-Pascal-meets-SDL-Website

units/sdlkeycode.inc

@@ -308,7 +308,7 @@ const
   KMOD_NUM = TSDL_KeyMod($1000);
   KMOD_CAPS = TSDL_KeyMod($2000);
   KMOD_MODE = TSDL_KeyMod($4000);
-  KMOD_RESERVED = TSDL_KeyMod($8000);
+  KMOD_SCROLL = TSDL_KeyMod($8000);
 
   KMOD_CTRL  = KMOD_LCTRL  or KMOD_RCTRL;
   KMOD_SHIFT = KMOD_LSHIFT or KMOD_RSHIFT;