fix(asset): explicit mimeType for MTL import from OBJ
fix(asset): explicit mimeType for MTL import from OBJ

stardazed/stardazed,zenmumbler/stardazed-tx,stardazed/stardazed-tx,zenmumbler/libzm,zenmumbler/libzm,stardazed/stardazed-tx,stardazed/stardazed-tx,stardazed/stardazed,zenmumbler/libzm,zenmumbler/stardazed-tx,zenmumbler/libzm,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx