Add Mana Tombs alternative Map File Name

[ForestJ316]

The [MPQ Patch] Classic/BC Dungeon Maps for WotLK map patch returns ManaTombs as the mapFileName from GetMapInfo() function. I don't know if there are other patches that make it as Mana-Tombs, so I just added an additional entry with the alternative name. Otherwise this throws an error: https://github.com/Zidras/DBM-Warmane/blob/60a9631f452a9a4e41d84b5104e14239940b3163/DBM-Core/DBM-Core.lua#L6556-L6563

Here is what GetMapInfo() prints when standing inside Mana-Tombs with this specific patch:

[Zidras]

@Trimitor could you check this when you have the chance?

[Trimitor]

@Trimitor could you check this when you have the chance?

I checked our pm in Discord. This bug appeared in 05/23/2022, the correct folder name is ManaTombs, so I think it's okay to remove the old name.

[Zidras]

Thank you both!