tests/resource/aws_launch_template: Fix new acceptance test failures
tests/resource/aws_launch_template: Fix new acceptance test failures

Previous output from acceptance testing:

```
    testing.go:538: Step 0 error: Error applying: 1 error occurred:
        	* aws_autoscaling_group.test: 1 error occurred:
        	* aws_autoscaling_group.test: Error creating AutoScaling Group: InvalidQueryParameter: Invalid launch template: When configuring an Auto Scaling group, your launch template must specify an instance type. Add a different launch template to the group and try again.
```

Output from acceptance testing:

```
--- PASS: TestAccAWSLaunchTemplate_basic (8.38s)
--- PASS: TestAccAWSLaunchTemplate_BlockDeviceMappings_EBS (45.99s)
--- PASS: TestAccAWSLaunchTemplate_BlockDeviceMappings_EBS_DeleteOnTermination (43.07s)
--- PASS: TestAccAWSLaunchTemplate_capacityReservation_preference (9.24s)
--- PASS: TestAccAWSLaunchTemplate_capacityReservation_target (14.43s)
--- PASS: TestAccAWSLaunchTemplate_creditSpecification_nonBurstable (7.62s)
--- PASS: TestAccAWSLaunchTemplate_creditSpecification_t2 (9.94s)
--- PASS: TestAccAWSLaunchTemplate_creditSpecification_t3 (9.77s)
--- PASS: TestAccAWSLaunchTemplate_data (7.80s)
--- PASS: TestAccAWSLaunchTemplate_description (15.76s)
--- PASS: TestAccAWSLaunchTemplate_disappears (5.88s)
--- PASS: TestAccAWSLaunchTemplate_EbsOptimized (36.37s)
--- PASS: TestAccAWSLaunchTemplate_IamInstanceProfile_EmptyConfigurationBlock (9.92s)
--- PASS: TestAccAWSLaunchTemplate_importBasic (10.89s)
--- PASS: TestAccAWSLaunchTemplate_importData (8.82s)
--- PASS: TestAccAWSLaunchTemplate_instanceMarketOptions (79.66s)
--- PASS: TestAccAWSLaunchTemplate_licenseSpecification (11.26s)
--- PASS: TestAccAWSLaunchTemplate_networkInterface (27.41s)
--- PASS: TestAccAWSLaunchTemplate_networkInterface_ipv6AddressCount (7.68s)
--- PASS: TestAccAWSLaunchTemplate_networkInterface_ipv6Addresses (7.83s)
--- PASS: TestAccAWSLaunchTemplate_tags (17.45s)
--- PASS: TestAccAWSLaunchTemplate_update (51.31s)
```

terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws