Fix white flash when changing upsampling to before post process. #5195
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Currently in master this is only a bug for DLSS I suspect, but I need to fix this for TAAU.
The wrong exposure texture was used with the reset history configuration that happens when switching to an upsampler that happens before post processing. I suspect other situations will trigger the same bug, but this is where I noticed it.
@remi-chapelain this fixes the issue you mentioned in the TAAU PR about white flashes, this PR is merged into that branch if you want to check.
Yamato: https://yamato.cds.internal.unity3d.com/jobs/902-Graphics/tree/HDRP%252Ffix-exposure-used-when-history-is-reset/.yamato%252Fall-hdrp.yml%2523PR_HDRP_2021.2