Fix launch_configuration error when using ebs which is encrypted

builtin/providers/aws/resource_aws_launch_configuration.go

@@ -334,13 +334,16 @@ func resourceAwsLaunchConfigurationCreate(d *schema.ResourceData, meta interface
 			bd := v.(map[string]interface{})
 			ebs := &autoscaling.Ebs{
 				DeleteOnTermination: aws.Bool(bd["delete_on_termination"].(bool)),
-				Encrypted:           aws.Bool(bd["encrypted"].(bool)),
 			}
 
 			if v, ok := bd["snapshot_id"].(string); ok && v != "" {
 				ebs.SnapshotId = aws.String(v)
 			}
 
+			if v, ok := bd["encrypted"].(bool); ok && v {
+				ebs.Encrypted = aws.Bool(v)
+			}
+
 			if v, ok := bd["volume_size"].(int); ok && v != 0 {
 				ebs.VolumeSize = aws.Int64(int64(v))
 			}