Actually set timestamp of DisallowedAsset

Author: Toastbrot236

Refresh.Database/GameDatabaseContext.Assets.cs

@@ -129,6 +129,7 @@ public void SetMainlinePhotoHash(GameAsset asset, string hash) =>
             AssetHash = hash,
             AssetType = type,
             Reason = reason,
+            DisallowedAt = this._time.Now,
         };
 
         this.DisallowedAssets.Add(disallowed);