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I found a bug in illuminanceMeasurement

When we don’t specify handler for illuminanceMearurement, it uses the default handler code in the /st/zigbee/defaults/illuminanceMeasurement_defaults.lua
But it throws error message as below.

thread encountered error: [string "st.zigbee.defaults.illuminanceMeasurement_def..."]:33: attempt to call a nil value (field 'pow')

I searched the web for this error message, and I found out that math.pow() is no longer available in Lua 5.3. Instead, we should use ^ operand.

So the source code should be changed into

function illuminance_measurement_defaults.illuminance_attr_handler(driver, device, value, zb_rx)
  local lux_value = math.floor(10 ^ ((value.value - 1) / 10000))
  device:emit_event_for_endpoint(zb_rx.address_header.src_endpoint.value, capabilities.illuminanceMeasurement.illuminance(lux_value))
end

I had to define the handler explicitly, like above, for illiminanceMeasurement to make it run without error.

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