unreachable else branch in feddes_et_reduction

https://git.ufz.de/mhm/mhm/-/blob/175eff0ba82690418410d8c0703694a64b7e8c8c/src/mHM/mo_soil_moisture.f90#L353 should be:

      !    SM >= FC
    if (soil_moist >= soil_moist_FC) then
      feddes_et_reduction = frac_roots
      ! PW < SM < FC
    else if (soil_moist > wilting_point) then
      feddes_et_reduction = frac_roots * (soil_moist - wilting_point) / (soil_moist_FC - wilting_point)
      ! SM <= PW
    else
      feddes_et_reduction = 0.0_dp
    end if