r/aws_dynamodb_table_item: fix to remove item elements on update

[johnsonaj]

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Closes #15700

Output from acceptance testing:

$ make testacc TESTS=TestAccTableItem_ PKG=dynamodb

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/dynamodb/... -v -count 1 -parallel 20 -run='TestAccTableItem_'  -timeout 180m
=== RUN   TestAccTableItem_basic
=== PAUSE TestAccTableItem_basic
=== RUN   TestAccTableItem_rangeKey
=== PAUSE TestAccTableItem_rangeKey
=== RUN   TestAccTableItem_withMultipleItems
=== PAUSE TestAccTableItem_withMultipleItems
=== RUN   TestAccTableItem_wonkyItems
=== PAUSE TestAccTableItem_wonkyItems
=== RUN   TestAccTableItem_update
=== PAUSE TestAccTableItem_update
=== RUN   TestAccTableItem_updateWithRangeKey
=== PAUSE TestAccTableItem_updateWithRangeKey
=== RUN   TestAccTableItem_disappears
=== PAUSE TestAccTableItem_disappears
=== CONT  TestAccTableItem_basic
=== CONT  TestAccTableItem_update
=== CONT  TestAccTableItem_withMultipleItems
=== CONT  TestAccTableItem_wonkyItems
=== CONT  TestAccTableItem_disappears
=== CONT  TestAccTableItem_updateWithRangeKey
=== CONT  TestAccTableItem_rangeKey
--- PASS: TestAccTableItem_wonkyItems (17.43s)
--- PASS: TestAccTableItem_disappears (20.71s)
--- PASS: TestAccTableItem_withMultipleItems (21.02s)
--- PASS: TestAccTableItem_basic (21.02s)
--- PASS: TestAccTableItem_rangeKey (22.57s)
--- PASS: TestAccTableItem_updateWithRangeKey (27.90s)
--- PASS: TestAccTableItem_update (29.14s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/dynamodb	31.577s
...

[anGie44]

LGTM 🚀

Output of acceptance tests:

make testacc TESTARGS='-run=TestAccTableItem_' PKG=dynamodb
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/dynamodb/... -v -count 1 -parallel 20  -run=TestAccTableItem_ -timeout 180m
=== RUN   TestAccTableItem_basic
=== PAUSE TestAccTableItem_basic
=== RUN   TestAccTableItem_rangeKey
=== PAUSE TestAccTableItem_rangeKey
=== RUN   TestAccTableItem_withMultipleItems
=== PAUSE TestAccTableItem_withMultipleItems
=== RUN   TestAccTableItem_wonkyItems
=== PAUSE TestAccTableItem_wonkyItems
=== RUN   TestAccTableItem_update
=== PAUSE TestAccTableItem_update
=== RUN   TestAccTableItem_updateWithRangeKey
=== PAUSE TestAccTableItem_updateWithRangeKey
=== RUN   TestAccTableItem_disappears
=== PAUSE TestAccTableItem_disappears
=== CONT  TestAccTableItem_basic
=== CONT  TestAccTableItem_update
=== CONT  TestAccTableItem_withMultipleItems
=== CONT  TestAccTableItem_rangeKey
=== CONT  TestAccTableItem_disappears
=== CONT  TestAccTableItem_wonkyItems
=== CONT  TestAccTableItem_updateWithRangeKey
--- PASS: TestAccTableItem_basic (27.12s)
--- PASS: TestAccTableItem_withMultipleItems (27.51s)
--- PASS: TestAccTableItem_disappears (28.01s)
--- PASS: TestAccTableItem_rangeKey (28.10s)
--- PASS: TestAccTableItem_wonkyItems (28.17s)
--- PASS: TestAccTableItem_updateWithRangeKey (39.55s)
--- PASS: TestAccTableItem_update (41.20s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/dynamodb	44.288s

[github-actions]

This functionality has been released in v4.19.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.