[SCC] Fix: correct ProfileAttachment for Updating a Profile Attachment

[tyao117]

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Closes #5718

Output from acceptance testing:

$ make testacc TEST=./ibm/service/scc  TESTARGS="-run TestAccIbmSccProfileAttachment*"
...
=== RUN   TestAccIbmSccProfileAttachmentDataSourceBasic
--- PASS: TestAccIbmSccProfileAttachmentDataSourceBasic (34.28s)
=== RUN   TestAccIbmSccProfileAttachmentDataSourceAllArgs
--- PASS: TestAccIbmSccProfileAttachmentDataSourceAllArgs (30.38s)
=== RUN   TestAccIbmSccProfileAttachmentBasic
--- PASS: TestAccIbmSccProfileAttachmentBasic (32.54s)
=== RUN   TestAccIbmSccProfileAttachmentAllArgs
--- PASS: TestAccIbmSccProfileAttachmentAllArgs (65.03s)