### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

Starting localstack with the CLI `PROVIDER_OVERRIDE_SQS=asf bin/localstack --debug start` starts up correctly but then uses the `default` SQS provider.

### Expected Behavior

I would expect it to start the asf provider.

### How are you starting LocalStack?

With the `localstack` script

### Steps To Reproduce

* `PROVIDER_OVERRIDE_SQS=asf bin/localstack --debug start`
* `awslocal sqs create-queue --queue-name "test-queue"`

logs show:

```
2021-12-27T14:08:43.274:DEBUG:plugin.manager: instantiating plugin PluginSpec(localstack.aws.provider.sqs:default = <function sqs at 0x7f30e6d2b820>)
2021-12-27T14:08:43.274:DEBUG:plugin.manager: loading plugin localstack.aws.provider:sqs:default
2021-12-27T14:08:43.278:INFO:localstack.services.infra: Starting mock SQS service on http port 4566 ...
2021-12-27T14:08:43.279:INFO:localstack.services.infra: Starting mock SQS service on http port 4566 ...
2021-12-27T14:08:43.279:INFO:localstack.services.motoserver: starting moto server on http://0.0.0.0:38335
```

### Environment

```markdown
- OS: Ubuntu 20.04
- LocalStack: 13.2
```


### Anything else?

_No response_
return platform.system() == "Linux"
LAMBDA_EXECUTOR = os.environ.get("LAMBDA_EXECUTOR", "").strip()
if not LAMBDA_EXECUTOR:
    LAMBDA_EXECUTOR = "docker"
    if not has_docker():
        LAMBDA_EXECUTOR = "local"
LAMBDA_FALLBACK_URL = os.environ.get("LAMBDA_FALLBACK_URL", "").strip()
LAMBDA_FORWARD_URL = os.environ.get("LAMBDA_FORWARD_URL", "").strip()
LAMBDA_CODE_EXTRACT_TIME = int(os.environ.get("LAMBDA_CODE_EXTRACT_TIME") or 25)
KINESIS_INITIALIZE_STREAMS = os.environ.get("KINESIS_INITIALIZE_STREAMS", "").strip()
ES_CUSTOM_BACKEND = os.environ.get("ES_CUSTOM_BACKEND", "").strip()
ES_ENDPOINT_STRATEGY = os.environ.get("ES_ENDPOINT_STRATEGY", "").strip() or "domain"
ES_MULTI_CLUSTER = is_env_not_false("ES_MULTI_CLUSTER")
OUTBOUND_HTTP_PROXY = os.environ.get("OUTBOUND_HTTP_PROXY", "")
OUTBOUND_HTTPS_PROXY = os.environ.get("OUTBOUND_HTTPS_PROXY", "")
ARN_PARTITION_REWRITING = is_env_true("ARN_PARTITION_REWRITING")
CONFIG_ENV_VARS = [
    "SERVICES",
    "HOSTNAME",
    "HOSTNAME_EXTERNAL",
    "LOCALSTACK_HOSTNAME",
    "LAMBDA_FALLBACK_URL",
    "LAMBDA_EXECUTOR",
    "LAMBDA_REMOTE_DOCKER",