fix indenting

This generic helper function strips nil values, empty arrays, and empty objects from the provided byte slice, preventing nil values from the AWS API response from being stored in the computed `json` attribute.

… case

This test verifies that nil values returned in the ApprovalRule response are appropriately scrubbed from the `json` attribute.

```console
% make testacc PKG=ssm TESTS=TestAccSSMPatchBaseline_
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.2 test ./internal/service/ssm/... -v -count 1 -parallel 20 -run='TestAccSSMPatchBaseline_'  -timeout 360m

--- PASS: TestAccSSMPatchBaseline_disappears (31.31s)
=== CONT  TestAccSSMPatchBaseline_tags_null
--- PASS: TestAccSSMPatchBaseline_rejectPatchesAction (37.77s)
=== CONT  TestAccSSMPatchBaseline_tags_DefaultTags_providerOnly
--- PASS: TestAccSSMPatchBaseline_approvedPatchesNonSec (39.94s)
=== CONT  TestAccSSMPatchBaseline_tags_DefaultTags_updateToProviderOnly
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_nullOverlappingResourceTag (43.85s)
=== CONT  TestAccSSMPatchBaseline_tags_DefaultTags_updateToResourceOnly
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_nullNonOverlappingResourceTag (43.91s)
=== CONT  TestAccSSMPatchBaseline_tags_DefaultTags_overlapping
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_emptyProviderOnlyTag (45.51s)
=== CONT  TestAccSSMPatchBaseline_tags_EmptyTag_OnUpdate_Replace
--- PASS: TestAccSSMPatchBaseline_tags_ComputedTag_OnCreate (49.76s)
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_emptyResourceTag (50.56s)
--- PASS: TestAccSSMPatchBaseline_operatingSystem (56.32s)
--- PASS: TestAccSSMPatchBaseline_sources (59.38s)
--- PASS: TestAccSSMPatchBaseline_approveUntilDateParam (59.69s)
--- PASS: TestAccSSMPatchBaseline_approvalRuleEmpty (67.48s)
--- PASS: TestAccSSMPatchBaseline_basic (67.74s)
--- PASS: TestAccSSMPatchBaseline_tags_AddOnUpdate (68.98s)
--- PASS: TestAccSSMPatchBaseline_tags_ComputedTag_OnUpdate_Replace (70.36s)
--- PASS: TestAccSSMPatchBaseline_tags_EmptyTag_OnCreate (72.92s)
--- PASS: TestAccSSMPatchBaseline_tags_null (42.16s)
--- PASS: TestAccSSMPatchBaseline_tags_ComputedTag_OnUpdate_Add (75.00s)
--- PASS: TestAccSSMPatchBaseline_tags_EmptyTag_OnUpdate_Add (85.97s)
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_updateToResourceOnly (42.60s)
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_updateToProviderOnly (46.77s)
--- PASS: TestAccSSMPatchBaseline_tags_EmptyTag_OnUpdate_Replace (41.84s)
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_nonOverlapping (89.47s)
--- PASS: TestAccSSMPatchBaseline_tags (100.06s)
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_overlapping (59.82s)
--- PASS: TestAccSSMPatchBaseline_tags_DefaultTags_providerOnly (77.53s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ssm        121.254s
```