Undo RemoveSharedFrameworkDependencies workaround (#55739)

Author: wtgodbe

eng/tools/RepoTasks/RemoveSharedFrameworkDependencies.cs

@@ -64,17 +64,12 @@ private void FilterDependencies(string targetPath, ISet<string> dependencyToRemo
                     var updatedGroup = new PackageDependencyGroup(group.TargetFramework, packages);
                     foreach (var dependency in group.Packages)
                     {
-                        // Hack to temporarily avoid using ISet.Contains
-                        if (!dependencyToRemove.Add(dependency.Id))
+                        if (dependencyToRemove.Contains(dependency.Id))
                         {
                             referencesFrameworkOnlyAssembly = true;
                             Log.LogMessage($"  Remove dependency on '{dependency.Id}'");
                             continue;
                         }
-                        else
-                        {
-                            dependencyToRemove.Remove(dependency.Id);
-                        }
 
                         packages.Add(dependency);
                     }
@@ -112,4 +107,4 @@ private void FilterDependencies(string targetPath, ISet<string> dependencyToRemo
             }
         }
     }
-}
+}