list resource/aws_dynamodb_table: Error handling cleanup

[gdavison]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

Cleans up error handling in aws_dynamodb_table listing

Output from Acceptance Testing

% make testacc PKG=dynamodb TESTS=TestAccDynamoDBTable_List_

--- PASS: TestAccDynamoDBTable_List_basic (34.86s)
--- PASS: TestAccDynamoDBTable_List_regionOverride (37.33s)
--- PASS: TestAccDynamoDBTable_List_includeResource (61.74s)

[github-actions]

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