internal/zstd: allow zero dictionary id

[AlexanderYastrebov]

A value of 0 has same meaning as no Dictionary_ID,
in which case the frame may or may not need a dictionary to be decoded,
and the ID of such a dictionary is not specified.

See facebook/zstd#2172

For #62513

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Message from Ian Lance Taylor:

Patch Set 2: Commit-Queue+1

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2023-09-28T02:45:50Z","revision":"7d095da5c22dcdcc2b3dca714d091a455cabb175"}

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Message from Ian Lance Taylor:

Patch Set 2: -Commit-Queue

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Patch Set 2:

This CL has passed the run

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Patch Set 2: LUCI-TryBot-Result+1

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Message from Ian Lance Taylor:

Patch Set 2: Auto-Submit+1 Code-Review+2

(1 comment)

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This PR is being closed because golang.org/cl/531515 has been merged.