Use RemoteClient.Delete for s3.Backend.DeleteState

[jbardin]

The s3.Backend was using it's own code for DeleteState, but the dynamo
entries are only handled through the RemoteClient. Have DeleteState use
a RemoteClient for delete.

Fixes #15161

[jbardin]

$ TF_ACC=1 go test -v 2> /dev/null
=== RUN   TestBackend_impl
--- PASS: TestBackend_impl (0.00s)
=== RUN   TestBackendConfig
--- PASS: TestBackendConfig (1.20s)
=== RUN   TestBackend
--- PASS: TestBackend (5.48s)
	backend_test.go:248: creating S3 bucket terraform-remote-s3-test-594d255e in us-east-1
=== RUN   TestBackendLocked
--- PASS: TestBackendLocked (28.77s)
	backend_test.go:248: creating S3 bucket terraform-remote-s3-test-594d2564 in us-east-1
	testing.go:240: TestBackend: testing state locking for *s3.Backend
=== RUN   TestBackendExtraPaths
--- PASS: TestBackendExtraPaths (7.65s)
	backend_test.go:248: creating S3 bucket terraform-remote-s3-test-594d2580 in us-east-1
=== RUN   TestRemoteClient_impl
--- PASS: TestRemoteClient_impl (0.00s)
=== RUN   TestRemoteClient
--- PASS: TestRemoteClient (2.28s)
	backend_test.go:248: creating S3 bucket terraform-remote-s3-test-594d2588 in us-east-1
=== RUN   TestRemoteClientLocks
--- PASS: TestRemoteClientLocks (23.07s)
	backend_test.go:248: creating S3 bucket terraform-remote-s3-test-594d258a in us-east-1
=== RUN   TestForceUnlock
--- PASS: TestForceUnlock (16.92s)
	backend_test.go:248: creating S3 bucket terraform-remote-s3-test-force-594d25a1 in us-east-1
=== RUN   TestRemoteClient_clientMD5
--- PASS: TestRemoteClient_clientMD5 (13.62s)
	backend_test.go:248: creating S3 bucket terraform-remote-s3-test-594d25b2 in us-east-1
=== RUN   TestRemoteClient_stateChecksum
--- PASS: TestRemoteClient_stateChecksum (16.69s)
	backend_test.go:248: creating S3 bucket terraform-remote-s3-test-594d25c0 in us-east-1
PASS

[ghost]

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