install: remove legacy code

ModpackUpdater.Manager/UpdateCheckResult.vb

@@ -2,9 +2,6 @@
 
 Public Class UpdateCheckResult
 
-    Public Property IsLegacy As Boolean
-    Public ReadOnly Property SyncFiles As New List(Of UpdateSyncFile)
-
     Public Property CurrentVersion As Version
     Public Property LatestVersion As Version
     Public ReadOnly Property UpdateActions As New List(Of UpdateAction)
@@ -12,11 +9,7 @@ Public Class UpdateCheckResult
 
     Public ReadOnly Property HasUpdates As Boolean
         Get
-            If IsLegacy Then
-                Return SyncFiles.Where(Function(n) n.SyncAction <> UpdateSyncAction.None).Any
-            Else
-                Return CurrentVersion < LatestVersion
-            End If
+            Return CurrentVersion < LatestVersion
         End Get
     End Property