Ticket #2640: sand256 skin update

Seems that the previous patch was incomplete. Especially the "Delete file?" dialog
sucks because the colors of the Yes and No buttons are the same, it's only the mouse
cursor that shows which one is active.

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

misc/skins/sand256.ini

@@ -97,11 +97,14 @@
     dfocus=;rgb452
     dhotnormal=;;underline
     dhotfocus=;rgb452;underline
+    dtitle=;;underline
 
 [error]
     _default_=rgb554;rgb320;bold
+    errdfocus=black;rgb452;bold
     errdhotnormal=;;bold+underline
-    errdhotfocus=black;rgb452;underline
+    errdhotfocus=black;rgb452;bold+underline 
+    errdtitle=;;bold+underline 
 
 [filehighlight]
     directory=