Update failing QuickInfo test (#17672)

Author: T-Gro

vsintegration/tests/FSharp.Editor.Tests/QuickInfoTests.fs

@@ -535,7 +535,7 @@ module Test =
         static let fu$$nc x = ()
 """
 
-        let expectedSignature = "val func: x: 'a -> unit"
+        let expectedSignature = "val private func: x: 'a -> unit"
 
         let tooltip = GetQuickInfoTextFromCode code