azurerm_app_service_slot - adding http2_enabled

[tombuildsstuff]

Fixes a Set error:

------- Stdout: -------
=== RUN   TestAccAzureRMAppServiceSlot_importBasic
--- FAIL: TestAccAzureRMAppServiceSlot_importBasic (48.44s)
    testing.go:513: Step 0 error: Error applying: 1 error(s) occurred:
        
        * azurerm_app_service_slot.test: 1 error(s) occurred:
        
        * azurerm_app_service_slot.test: Invalid address to set: []string{"site_config", "0", "http2_enabled"}
    testing.go:573: Error destroying resource! WARNING: Dangling resources
        may exist. The full state and error is shown below.
        
        Error: Error refreshing: 1 error(s) occurred:
        
        * azurerm_app_service_slot.test: azurerm_app_service_slot.test: Invalid address to set: []string{"site_config", "0", "http2_enabled"}
        
        State: <nil>
FAIL

[tombuildsstuff]

Tests pass:

[ghost]

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