Fix unsupportedProviderDowngradeMessage message

Currently we format the message incorrectly, which causes output
like:
Downgrade is not supported for provider aws%!!(MISSING)(EXTRA string=cluster-api)

internal/controller/preflight_checks.go

@@ -231,7 +231,7 @@ func checkProviderVersion(ctx context.Context, providerVersion string, provider
 				operatorv1.PreflightCheckCondition,
 				operatorv1.UnsupportedProviderDowngradeReason,
 				clusterv1.ConditionSeverityError,
-				fmt.Sprintf(unsupportedProviderDowngradeMessage, provider.GetName(), configclient.ClusterAPIProviderName),
+				fmt.Sprintf(unsupportedProviderDowngradeMessage, provider.GetName()),
 			))
 
 			return fmt.Errorf("downgrade is not supported for provider %q", provider.GetName())