API diff update.

src/Avalonia.Styling/ApiCompatBaseline.txt

@@ -0,0 +1,4 @@
+Compat issues with assembly Avalonia.Styling:
+InterfacesShouldHaveSameMembers : Interface member 'public System.Boolean Avalonia.Styling.IStyleInstance.IsActive' is present in the implementation but not in the contract.
+InterfacesShouldHaveSameMembers : Interface member 'public System.Boolean Avalonia.Styling.IStyleInstance.IsActive.get()' is present in the implementation but not in the contract.
+Total Issues: 2