Remove patch to use absl::optional in third_party/shell-encryption

std::optional is just fine and preferred now.

Bug: 40242125
Change-Id: I57f7e0207b75a60124964c3acc20b971c08c14f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5698386
Commit-Queue: Amr Aboelkher <[email protected]>
Reviewed-by: Amr Aboelkher <[email protected]>
Auto-Submit: David Benjamin <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1326712}
NOKEYCHECK=True
GitOrigin-RevId: 24ebcea5cee012b29124a4a4c3c8cd3c4c8e462c
2 files changed