fix(ai): Fix fraction seconds bug with ProtoDuration

[daymxn]

This PR fixes a minor bug I came across in the ProtoDuration decoding. It's not a emergency release worthy bug, but it can produce an incorrect nanosecond value (ie; instead of 123000000 it currently produces 123). In practicality, this means that within LiveServerGoingAwayNotice, the timeLeft field could be off by +-1 second.

Tests have been added for ProtoDuration as well, to help avoid this in the future.

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