tests/resource/aws_opsworks_application: Fix ImportStateVerifyIgnore for TestAccAWSOpsworksApplication_basic (#15547)
tests/resource/aws_opsworks_application: Fix ImportStateVerifyIgnore for TestAccAWSOpsworksApplication_basic (#15547)

The Terraform Plugin SDK v2.0.4 upgrade lost the ability to track TypeSet attributes with the proper indexing, similar to how other checks needed similar fixes. Rather than `ImportStateVerifyIgnore` individual `environment` attribute bits, this changes the testing to the standard of just including the attribute itself.

Previously:

```
=== CONT  TestAccAWSOpsworksApplication_basic
TestAccAWSOpsworksApplication_basic: resource_aws_opsworks_application_test.go:22: ImportStateVerify attributes not equivalent. Difference is shown below. Top is actual, bottom is expected.
(map[string]string) {
}
(map[string]string) (len=4) {
(string) (len=15) "environment.0.%": (string) (len=1) "3",
(string) (len=17) "environment.0.key": (string) (len=4) "key1",
(string) (len=20) "environment.0.secure": (string) (len=5) "false",
(string) (len=19) "environment.0.value": (string) (len=6) "value1"
}
--- FAIL: TestAccAWSOpsworksApplication_basic (72.51s)
```

Output from acceptance testing:

```
--- PASS: TestAccAWSOpsworksApplication_basic (74.52s)
```
terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws