fix the issue #158

[GuopengLin]

SUMMARY

since the field "description" is not in the field "properties", but just in old_definition, I edit the code "old_definition['properties']['description']" to old_definition['description'], and it works fine!

Fixes #158

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

azure_rm_roledefinition

ADDITIONAL INFORMATION

** after change **

TASK [azure.azcollection.azure_rm_roledefinition] **************************************************************************************************************************
[WARNING]: Azure API profile latest does not define an entry for AuthorizationManagementClient
changed: [localhost]

PLAY RECAP *****************************************************************************************************************************************************************
localhost                  : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0