Added some missing musics to some zones, including new tracks

game/modules/tome/data/music/Enemy at the gates.ogg

game/modules/tome/data/music/Inside a dream.ogg

game/modules/tome/data/zones/briagh-lair/zone.lua

game/modules/tome/data/zones/flooded-cave/zone.lua

game/modules/tome/data/zones/murgol-lair/zone.lua

game/modules/tome/data/zones/ritch-tunnels/zone.lua

game/modules/tome/data/zones/ruined-dungeon/zone.lua

game/modules/tome/data/zones/temple-of-creation/zone.lua

game/modules/tome/data/zones/valley-moon-caverns/zone.lua