oauth2: replace a magic number with AuthStyleUnknown

[masonelmore]

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Message from Matt Hickford:

Patch Set 1: Code-Review+1 Run-TryBot+1

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Patch Set 1:

(1 comment)

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Patch Set 1: TryBot-Result+1

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Message from Sean Liao:

Patch Set 1:

(2 comments)

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Message from Mason Elmore:

Patch Set 2:

(2 comments)

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Message from Sean Liao:

Patch Set 2: Code-Review+2

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Message from Sean Liao:

Patch Set 2: Auto-Submit+1 Commit-Queue+1

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Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-04-18T11:19:14Z","revision":"936d5e1059249026172b73fcecc40098841a5c2c"}

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Message from Sean Liao:

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 David Chase:

Patch Set 2: Code-Review+2

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