Improved ego chances on items in vaults

game/modules/tome/data/maps/vaults/circle.lua

game/modules/tome/data/maps/vaults/crypt.lua

game/modules/tome/data/maps/vaults/diggers.lua

game/modules/tome/data/maps/vaults/double-t.lua

game/modules/tome/data/maps/vaults/dragon-loot.lua

game/modules/tome/data/maps/vaults/dragon_lair.lua

...modules/tome/data/maps/vaults/forest-ruined-building1.lua

game/modules/tome/data/maps/vaults/forest-snake-pit.lua

game/modules/tome/data/maps/vaults/greater-checkerboard.lua

game/modules/tome/data/maps/vaults/hillbert_curve.lua

game/modules/tome/data/maps/vaults/honey_glade.lua

game/modules/tome/data/maps/vaults/honey_glade_dark.lua

game/modules/tome/data/maps/vaults/hostel.lua

game/modules/tome/data/maps/vaults/mage-hideout-dark.lua

game/modules/tome/data/maps/vaults/mage-hideout.lua

game/modules/tome/data/maps/vaults/orc-armoury.lua

game/modules/tome/data/maps/vaults/treasure1.lua

game/modules/tome/data/maps/vaults/troll-hideout-dark.lua

game/modules/tome/data/maps/vaults/troll-hideout.lua