First day with temperature threshold reached does not benefits from RL improvements

[aulemahal]

The generic first_day_temperature_reached does not use rl.resample_and_rl, which make the potential improvments of inverting the operation order inaccessible.

xclim/xclim/indices/generic.py

Lines 947 to 953 in edf1e13

	out: xarray.DataArray = cond.resample(time=freq).map(
	rl.first_run_after_date,
	window=window,
	date=after_date,
	dim="time",
	coord="dayofyear",
	)