remove unneeded data from internal data

SPTInstaller/Models/InternalData.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using SPTInstaller.Models.Mirrors;
 
 namespace SPTInstaller.Models;
 
@@ -44,11 +45,6 @@ public class InternalData
     /// </summary>
     public string PatcherMirrorsLink { get; set; }
 
-    /// <summary>
-    /// The release download mirrors for the patcher
-    /// </summary>
-    public List<DownloadMirror> PatcherReleaseMirrors { get; set; } = null;
-
     /// <summary>
     /// Whether or not a patch is needed to downgrade the client files
     /// </summary>