acfloria b95d65df53 Commander: Fix bug when changing to high latency telemetry
Due to the old heartbeat of the high latency telemetry when activating it after flying sufficiently long in normal telemetry it is first detected as lost until the first message is sent.
By updating the heartbeat to the current time on switching this issue is avoided.

Also includes a small style fix for the HIGH_LATENCY2 stream
2018-04-11 15:15:28 +02:00
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