KomaUI phantom update when function. (Enhancement)

[curtcorum]

Update the text field (currently updated when file changes) when using:

obj_ui[] = brain_phantom3D()

or other phantom function. Info about the function and arguments for screenshots and repeatability.

https://github.com/JuliaHealth/KomaMRI.jl/blob/bea8f5f9f46f65771de9fa81771c82f645bbe994/src/ui/ExportUIFunctions.jl#L203