Fixed materials not converting correctly if they have underscores in their name

[LagoLunatic]

When materials are converted from BDL -> DAE, AssimpNet automatically converts parentheses in their names to underscores.
So then when loading the materials back from materials.json for converting DAE -> BMD, there's code that converts underscores back to parentheses.

But that code causes issues for material names that originally had underscores in their name (like a material in the Hero's Charm model), since the underscores are converted to parentheses and then detection of which material is which doesn't work.
So I changed how it compares material names so that it works correctly for materials that have underscores in them and also for ones that have parentheses in them.