Fix TypedTreePickle linked file names (#9323)

Author: auduchinok

fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj

@@ -408,10 +408,10 @@
       <Link>TypedTree/TypedTreeOps.fs</Link>
     </Compile>
     <Compile Include="$(FSharpSourcesRoot)/fsharp/TypedTreePickle.fsi">
-      <Link>TypedTree/.TypedTreePickle.fsi</Link>
+      <Link>TypedTree/TypedTreePickle.fsi</Link>
     </Compile>
     <Compile Include="$(FSharpSourcesRoot)/fsharp/TypedTreePickle.fs">
-      <Link>TypedTree/.TypedTreePickle.fs</Link>
+      <Link>TypedTree/TypedTreePickle.fs</Link>
     </Compile>
     <Compile Include="$(FSharpSourcesRoot)/fsharp/import.fsi">
       <Link>Logic/import.fsi</Link>