Fix shared shared v2 role display name update issue

[PasinduYeshan]

Issue:

In the current implementation of the API, there's an issue when attempting to update the display name of a shared v2 role. When following the steps outlined below, the API returns a 500 Internal Server Error:

Steps to Reproduce:

• Create an application with the allowed audience type set as "Application."
• Create a role with the audience set as "Application."
• Share the application.
• Attempt to update the display name of the shared v2 role.

This PR fixes above mentioned issue.

Related Issue

• [Feature] Support application roles for Identity Server and support RBAC for apps product-is#16363