There are only 248 default colors in the 256-color mode palette, and the remaining 8 colors are not altered by mode changes. Fixes font and mouse pointer colors in Voyages of Discovery.

git-svn-id: http://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3852 ed541006-0bf7-43e9-8c4d-6fc63c346d47