azurerm_windows_web_app, azurerm_windows_web_app_slot, azurerm_linux_web_app, azurerm_linux_web_app_slot, azurerm_windows_function_app, azurerm_windows_function_app_slot, azurerm_linux_function_app, azurerm_linux_function_app_slot - fix cors setting

[xiaxyi]

There is a default value from the api side:

 "cors": {
            "allowedOrigins": [],
            "supportCredentials": false
        },

do not set the value if it's not specified by user.

fix #19323

[jackofallops]

Closing as superseded by 19685

[drdamour]

#19685 ?

[github-actions]

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