AdoX GetRelations returns all key types not just foreign keys (#245)

* GetRelations only needs to return rows for foreign keys and not unique or primary keys. This makes it match DAO

src/EFCore.Jet.Data/AdoxSchema.cs

@@ -419,6 +419,11 @@ public override DataTable GetRelations()
 
                     var relationName = (string)key.Name;
                     var principalTableName = (string)key.RelatedTable;
+                    var keyType = (KeyTypeEnum)key.Type;
+                    if (keyType != KeyTypeEnum.adKeyForeign)
+                    {
+                        continue;
+                    }
 
                     var relationType = !_naturalOnly ? "MANY" : null; // we don't know what kind of relationship this is