rate: fix truncated seconds in tokensFromDuration

[changkun]

This CL fixes a truncated variable which may cause an incorrect result.

Fix golang/go#34861

[gopherbot]

This PR (HEAD: e9c4c03) has been imported to Gerrit for code review.

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[gopherbot]

Message from Eric Lagergren:

Patch Set 1:

Relates to https://go-review.googlesource.com/c/time/+/200900

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[gopherbot]

Message from Brad Fitzpatrick:

Patch Set 1: Run-TryBot+1

(1 comment)

R=sameer

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[gopherbot]

Message from Gobot Gobot:

Patch Set 1:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=7bd81c57

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[gopherbot]

Message from Gobot Gobot:

Patch Set 1: TryBot-Result+1

TryBots are happy.

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[gopherbot]

This PR (HEAD: ee5d930) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/time/+/200917 to see it.

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[gopherbot]

Message from Changkun Ou:

Patch Set 2: Code-Review+1

(1 comment)

Patch Set 1: Run-TryBot+1

(1 comment)

R=sameer

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[gopherbot]

Message from Sameer Ajmani:

Patch Set 2:

(3 comments)

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