Fixed build error in ControlPanelTests

Author: stidsborg

Core/Cleipnir.ResilientFunctions.Tests/TestTemplates/RFunctionTests/ControlPanelTests.cs

@@ -324,7 +324,7 @@ protected async Task SucceedingExistingParamlessFromControlPanelSucceeds(Task<IF
         using var functionsRegistry = new FunctionsRegistry(store, new Settings(unhandledExceptionCatcher.Catch));
         var paramlessRegistration = functionsRegistry.RegisterParamless(
             functionTypeId,
-            inner: () => throw new Exception("oh no")
+            inner: Task () => throw new Exception("oh no")
         );
 
         await Should.ThrowAsync<Exception>(() => paramlessRegistration.Invoke(functionInstanceId.Value));