Fix Level 50 Dungeons

[Catwho]

We also need the Heavensward dungeons to be included as a Roulette. Outside of leveling and story progression, there's no real reason to go back to them (a Lv57 player mostly would never queue for Dusk Vigil for leveling purposes).

The 51-59 dungeons are already part of Leveling Roulette. However, the 60 story dungeon is not, since it does not give exp.