Fix pathway creation

src/sequences/diffusion_spin_echoes.jl

@@ -62,7 +62,7 @@ end
 
 get_pulse(ge::DiffusionSpinEcho) = (excitation=ge.excitation, refocus=ge.refocus)
 get_readout(ge::DiffusionSpinEcho) = ge.readout
-get_pathway(ge::DiffusionSpinEcho) = Pathway(ge, [90, 180], 1, :DWI)
+get_pathway(ge::DiffusionSpinEcho) = Pathway(ge, [90, 180], 1, group=:DWI)
 echo_time(ge::DiffusionSpinEcho) = 2 * (effective_time(ge, :refocus) - effective_time(ge, :excitation))
 delay(ge::DiffusionSpinEcho) = duration_transverse(ge) - echo_time(ge)
 diffusion_time(ge::DiffusionSpinEcho) = start_time(ge, :gradient2) - start_time(ge, :gradient)