use Planck2018EE+BAO+SN defaults in example.conf

[Findus23]

taken from

monofonIC/src/cosmology_parameters.cc

Lines 89 to 105 in 22e71a5

	{"Planck2018EE+BAO+SN", {
	{"h", 0.67742},
	{"Omega_m", 0.3099},
	{"Omega_b", 0.048891054},
	{"Omega_DE", 0.6901},
	{"w_0", -1.0},
	{"w_a", 0.0},
	{"n_s", 0.96822},
	{"A_s", 2.1064e-9},
	{"k_p", 0.05},
	{"YHe", 0.245421},
	{"N_ur", 2.046},
	{"m_nu1", 0.06},
	{"m_nu2", 0.0},
	{"m_nu3", 0.0},
	{"Tcmb", 2.7255}}}
	};

Also added ## to sigma_8 to indicate that it is different from the other parameters and doesn't have a Planck2018EE+BAO+SN default (so one should not uncomment all lines at the same time).