fix(gptimer): remove incorrect param from example (IDFGH-13420)

[LonerDan]

Fixes call to gptimer_start in one of the examples which includes extra second parameter &alarm_config, when the function takes only one.

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[LonerDan]

This is a resubmit of accidentally closed PR #14310

[suda-morris]

FYI, the fix is already merged in 08fa113