Modifies tests as filter result uses a parent-child relationship by d…

…efault (#1020)

# Pull Request

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Fixes insightsengineering/teal.slice#502

Part of insightsengineering/teal.slice#503 and
insightsengineering/teal.data#215

### Changes 

- Corrects test to reflect behavior resulting from `teal.data` default
parent setting when creating new `join_key`

tests/testthat/test-module_nested_tabs.R

@@ -371,7 +371,7 @@ testthat::test_that(".datasets_to_data returns data which is filtered", {
   d1_filtered <- data[["d1"]]
   testthat::expect_equal(d1_filtered, data.frame(id = 1:2, pk = 2:3, val = 1:2))
   d2_filtered <- data[["d2"]]
-  testthat::expect_equal(d2_filtered, data.frame(id = 1:5, value = 1:5))
+  testthat::expect_equal(d2_filtered, data.frame(id = 2:3, value = 2:3))
 })