testing/synctest: fix inverted test failure message in TestContextAfterFunc

[fgm]

Fixes #75685

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Patch Set 1:

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Patch Set 2:

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Patch Set 6:

(1 comment)

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Message from Frederic Marand (FGM):

Patch Set 6:

(2 comments)

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Message from Sean Liao:

Patch Set 7: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Patch Set 7:

Dry run: CV is trying the patch.

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Patch Set 7: -Commit-Queue

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Patch Set 7: LUCI-TryBot-Result+1

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Message from Alan Donovan:

Patch Set 7: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Patch Set 7:

Dry run: CV is trying the patch.

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Message from Alan Donovan:

Patch Set 7: -Commit-Queue

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This PR is being closed because golang.org/cl/708275 has been merged.