Fix flag name for gen-provider-azure TestDefinition

```other operator
The gen-provider-azure TestDefinition is now passing the correct flag to the generator.
```

Signed-off-by: ialidzhikov <i.alidjikov@gmail.com>

Author: ialidzhikov

.test-defs/provider-azure.yaml

@@ -14,5 +14,5 @@ spec:
     --controlplane-provider-config-filepath=$CONTROLPLANE_PROVIDER_CONFIG_FILEPATH
     --network-vnet-cidr=$NETWORK_VNET_CIDR
     --network-worker-cidr=$NETWORK_WORKER_CIDR
-    --zone=$ZONE
+    --zoned=$ZONED
   image: eu.gcr.io/gardener-project/3rd/golang:1.15.5

test/tm/generator.go

@@ -26,7 +26,7 @@ import (
 
 	"github.com/gardener/gardener/extensions/test/tm/generator"
 	"github.com/pkg/errors"
-	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	log "sigs.k8s.io/controller-runtime/pkg/log"
 	"sigs.k8s.io/controller-runtime/pkg/log/zap"
 )
@@ -72,7 +72,7 @@ func main() {
 	}
 
 	infra := v1alpha1.InfrastructureConfig{
-		TypeMeta: v1.TypeMeta{
+		TypeMeta: metav1.TypeMeta{
 			APIVersion: v1alpha1.SchemeGroupVersion.String(),
 			Kind:       reflect.TypeOf(v1alpha1.InfrastructureConfig{}).Name(),
 		},
@@ -86,7 +86,7 @@ func main() {
 	}
 
 	cp := v1alpha1.ControlPlaneConfig{
-		TypeMeta: v1.TypeMeta{
+		TypeMeta: metav1.TypeMeta{
 			APIVersion: v1alpha1.SchemeGroupVersion.String(),
 			Kind:       reflect.TypeOf(v1alpha1.ControlPlaneConfig{}).Name(),
 		},