Fix failing unit test in protoc_wrapper_test.py

A recent change added the `--ts_proto_opt=useOptionals=all` flag to the
protoc command but did not update the corresponding test expectation.

This CL updates the mocked call assertion to include the new flag,
aligning the test with the current script behavior and fixing the
breakage.

Bug: 430336825

Change-Id: Ia05fdf7c35fe5254262c282c778ee60024db34b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6718867
Reviewed-by: Sophie Chang <[email protected]>
Commit-Queue: Alex Attar <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1484473}
NOKEYCHECK=True
GitOrigin-RevId: e6b0e16d47043e7627aeb6fe1cc81383e2923f0f
1 file changed