Reference resource as singular rather than an array in output

[abferm]

what

• Remove splat which returns array

why

• Array not desired output
• The "datapipeline_ids" output references the "aws_cloudformation_stack.datapipeline" as though it produces the array. This hasn't been the case since 8bc76ef.

Error: Error refreshing state: 1 error(s) occurred:

* module.efs_backup.output.datapipeline_ids: __builtin_StringToInt: strconv.ParseInt: parsing "DataPipelineId": invalid syntax in:

${aws_cloudformation_stack.datapipeline.*.outputs["DataPipelineId"]}