Don't set securityGroup name, as all compose apps will create a `DefaultNetwork`

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

ecs/awsResources.go

@@ -189,7 +189,6 @@ func (b *ecsAPIService) ensureNetworks(r *awsResources, project *types.Project,
 		securityGroup := networkResourceName(name)
 		template.Resources[securityGroup] = &ec2.SecurityGroup{
 			GroupDescription: fmt.Sprintf("%s Security Group for %s network", project.Name, name),
-			GroupName:        securityGroup,
 			VpcId:            r.vpc,
 			Tags:             networkTags(project, net),
 		}

ecs/testdata/simple/simple-cloudformation-conversion.golden

@@ -37,7 +37,6 @@
     "DefaultNetwork": {
       "Properties": {
         "GroupDescription": "TestSimpleConvert Security Group for default network",
-        "GroupName": "DefaultNetwork",
         "Tags": [
           {
             "Key": "com.docker.compose.project",