fix(Cloud Databases): always include host flavor with scaling requests

[alexhemard]

Workaround to fix validation errors that expect host flavor to be included with scaling request.

Host flavor will be included with each scaling API request.

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccIBMDatabaseInstancePostgresGroup'
--- PASS: TestAccIBMDatabaseInstancePostgresGroup (1228.55s)

...

[omaraibrahim]

LGTM