Fix optional_claims handling for azure_rm_adapplication

[kent007]

SUMMARY Fixes https://github.com/ansible-collections/azure/issues/1475

ISSUE TYPE Bugfix Pull Request

COMPONENT NAME azure_rm_adapplication

ADDITIONAL INFORMATION I copied the format already present for manipulating other complex fields. Conceivably this could be divided into 3 module level args instead of a single complex arg, but I don't see any direct benefit for doing so. Tests seem to work okay against my azure instance.

Previously filed in https://github.com/ansible-collections/azure/pull/1479 and https://github.com/ansible-collections/azure/pull/1476, closed those while I was reworking branches on my fork