Backing member for a DependencyProperty should be static and readonly

Proprietary

A DependencyProperty or DependencyPropertyKey is registered once per owner type, so its backing field or property must be static readonly. Adds the missing modifiers.

OpenRewrite.Recipes.CSharp.CodeQuality.Wpf.MakeDependencyPropertyBackingMemberStaticReadonly

mod run . --recipe=OpenRewrite.Recipes.CSharp.CodeQuality.Wpf.MakeDependencyPropertyBackingMemberStaticReadonly

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