provider/aws: aws_elastisearch_domain tags not being set correctly.

[stack72]

Fixes #5325. The top level object was used not the tags list within

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSElasticSearchDomain_basic' 2>~/tf.log
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSElasticSearchDomain_basic -timeout 120m
=== RUN   TestAccAWSElasticSearchDomain_basic
--- PASS: TestAccAWSElasticSearchDomain_basic (1114.63s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    1114.658s

[stack72]

Just a FYI, the addition of tags to the basic test actually masked this issue. There is another test in place that checks for tags

[radeksimko]

LGTM. Merge at will.

[ghost]

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