luis settings is not parsed correctly

[xieofxie]

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Version

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Describe the bug

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Here it uses @{}: https://github.com/microsoft/botbuilder-dotnet/blob/master/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/ToDoLuisBot/ToDoLuis.en-us.lu.dialog

However, now it uses custom parser here instead of LG, so it is incorrect. https://github.com/microsoft/botbuilder-dotnet/blob/master/libraries/Microsoft.Bot.Builder.Dialogs.Declarative/Loaders/LuisRecognizerLoader.cs

Should we use LG there?

To Reproduce

Steps to reproduce the behavior:

1. Open Microsoft.Bot.Builder.TestBot.Json
2. Select ToDoLuisBot

Expected behavior

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Screenshots

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Additional context

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[bug]

[boydc2014]

@vishwacsena this might be a loophole that perhaps some field in dialog, we also want to be expression?