get_\phi should have the return_array keyword

[odunbar]

Purpose

EnsembleKalmanProcesses.jl/src/EnsembleKalmanProcess.jl

Line 277 in fb45f75

function get_ϕ(prior::ParameterDistribution, ekp::EnsembleKalmanProcess, iteration::IT) where {IT <: Integer}

The return_array keyword is provided for get_u and get_g, and should be also for get_\phi, which in the end just transforms the output of get_u. It is a likely use case and simply fixed