Landscape editor doesn't find layers in material functions

Comments from Jack:
>LandscapeMaterialsParameterValuesGetter calls GetAllParameterNames<> which does handle functiions
>ALandscapeProxy::GetLayersFromMaterial
should use GetAllParameterNames<> instead of its current hardcoded version

Create a material function containing one of the landscape nodes (Layer Weight / Switch / Sample / Blend) and set the layer name to "Layer1"
Create a material using that function
Apply the material to a landscape
"Layer1" does not show up in the landscape paint tool

Creating the same as a material instead of a material function works fine.

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

Fix UE-51650

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