corrected reversed order of spawnrate and stealth in ANCIENT_RUINS_DEPLETED_SPECIAL

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5683 dbd5520b-6a0a-0410-a553-f54834df5b05
Merge remote-tracking branch 'svn-mirror/master'