turnip: Fix enabling of IB2 skipping.
We weren't setting LOCAL, so unless freedreno GL had set it since the GPU
woke up, we wouldn't get it.
This requires moving the GLOBAL unsetting out of tile_store's IB, since it
would never be executed when it mattered, anyway.
No perf difference detected on gfxbench vk-5-normal, or ANGLE minecraft,
genshin, and pubg.