go/printer: remove leftover code from type lists

[bdchodos]

The prev var is set to nil in every loop iteration so the condition
to prevent a line break is never true.

Functionality originally added in CL 273226 and removed in CL 359135.

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Patch Set 1:

(1 comment)

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Message from Ben Chodos:

Patch Set 1:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 1: Commit-Queue+1

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Patch Set 1: -Commit-Queue

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Patch Set 1: LUCI-TryBot-Result+1

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