bytes: improve consistency in split test messages

[jjpinto]

This change improves consistency in the error messages used by TestSplit and TestSplitAfter in bytes_test.go

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Jorge Pinto:

Patch Set 3:

(1 comment)

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Message from Jorropo:

Patch Set 3: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Message from Go LUCI:

Patch Set 3:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-12-23T18:44:58Z","revision":"4e7fd367d5ed7b854f4971af92fb00a500b0c494"}

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Message from Jorropo:

Patch Set 3: -Commit-Queue

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Patch Set 3:

This CL has passed the run

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Patch Set 3: LUCI-TryBot-Result+1

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Message from Michael Knyszek:

Patch Set 3: Code-Review+2

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Message from Dmitri Shuralyov:

Patch Set 3: Code-Review+1

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[gopherbot]

This PR is being closed because golang.org/cl/732300 has been merged.