.Net: Fix bug in sqlite filter logic (microsoft#11356)

### Motivation and Context

microsoft#11132

### Description

Fix bug in sqlite filter logic

### Contribution Checklist

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- [ ] The PR follows the [SK Contribution
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raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

Author: westey-m

dotnet/src/Connectors/Connectors.Memory.Sqlite/SqliteVectorStoreRecordCollection.cs

@@ -187,7 +187,7 @@ public virtual Task<VectorSearchResults<TRecord>> VectorizedSearchAsync<TVector>
         string? extraWhereFilter = null;
         Dictionary<string, object>? extraParameters = null;
 
-        if (searchOptions.Filter is not null)
+        if (searchOptions.OldFilter is not null)
         {
             if (searchOptions.Filter is not null)
             {