Fix unsigned/signed comparison warning in Metronome.cpp
`xTaskGetTickCount()` returns a `TickType_t`, which is defined as an `uint32_t`. This is compared to the `bpm` variable, which is a `int16_t` in the range of 40 to 220 as defined in the constructor. ```cpp lv_arc_set_range(bpmArc, 40, 220); ``` Just assume that `bpm` is greater than 0, as this would result in a divison by zero or negative values, which would unintentionally underflow to a very large number.main
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3eb73774a3
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63477fc096
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