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L4D1 Bus ref texture fixes for L4D2

went down a rabbit hole and found some weird stuff going on with the bus models in l4d2

one of which, is that the ref textures in l4d1 are replaced in l4d2, so both bus models use the same ref textures

this mod edits the vmts so it'll load the l4d1 ref textures for the l4d1 buses instead of the l4d2 ref textures, also restores the bus01_b vmt file so refs will load for the l4d1 buses that aren't set to a skingroup of 1.

l4d1 buses will now have brighter window reflections but metal parts of the bus won't be as shiny as the l4d2 bus.
l4d2 buses will keep it's darker window reflections but keep their shiny metal parts.

fun facts about the bus I learned

1: l4d1 has the oppisite issue too, where the l4d2 bus uses the l4d1 refs for The Sacrifice Campaign instead of the l4d2 ones.

2: the ref texture in l4d1 for bus01_b doesn't match the actual texture at all, it gets used in l4d1 anyways but doesn't line up with anything UV wise. It does seem to line up with the church bus wheel textures interestingly enough.

3: L4D2 buses in The Parish & Dark Carnival still have skingroups set to 1 in the maps, despite not having any skingroups anymore, but the l4d1 bus does.