go/printer: do not set impliedSemi to false in print, while writing newlines

[mateusz834]

Lets say we are writing an *ast.Ident, and this code causes impliedSemi
to set to false (from true), this doesn't make any sense to me, because
we are writing this ident after adding these newlines, thus impliedSemi
should be still set to true.

Fixes #70978

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[gopherbot]

Message from Mateusz Poliwczak:

Patch Set 1: Commit-Queue+1

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-12-24T14:37:03Z","revision":"6e2581a971cdef63ed3ea125c3a790bc95a049c9"}

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Message from Mateusz Poliwczak:

Patch Set 1: -Commit-Queue

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Patch Set 1:

This CL has passed the run

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Patch Set 1: LUCI-TryBot-Result+1

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