Actually fix deleting profile images (hopefully)

Jellyfin.Server.Implementations/Users/UserManager.cs

@@ -670,12 +670,9 @@ namespace Jellyfin.Server.Implementations.Users
         /// <inheritdoc/>
         public void ClearProfileImage(User user)
         {
-#nullable disable
-            // TODO: Remove these when User has nullable annotations
-
-            // Can't just set the value to null, as it hasn't been loaded yet, so EF Core wouldn't see the change
-            _dbProvider.CreateContext().Entry(user).Reference(u => u.ProfileImage).CurrentValue = null;
-#nullable enable
+            var dbContext = _dbProvider.CreateContext();
+            dbContext.ImageInfos.Remove(user.ProfileImage);
+            dbContext.SaveChanges();
         }
 
         private static bool IsValidUsername(string name)