probe_oen.pio doesn't set SWCLK as a sideset pin

[lurch]

Whilst looking at #194 I noticed that probe.pio says:

    // Set SWCLK as a sideset pin
    sm_config_set_sideset_pins(sm_config, PROBE_PIN_SWCLK);

(i.e. the comment matches the code), whereas probe_oen.pio says:

    // Set SWDIOEN and SWCLK as sideset pins
    sm_config_set_sideset_pins(sm_config, PROBE_PIN_SWDIOEN);

i.e. despite what the comment says, it doesn't actually set SWCLK as a sideset pin.

Not being familiar with how this code works, I don't know if probe_oen.pio is accidentally missing a sm_config_set_sideset_pins(sm_config, PROBE_PIN_SWCLK); line, or whether the comment simply needs updating to // Set SWDIOEN as a sideset pin ? 🤷‍♂️