Invalid paths resolving

The problem occured loading `cloud/texttospeech/v1/cloud_tts_lrs.proto`. It try to load the related file with duplicated path. The substring of the path is duplicated in the error message ("**google\cloud\texttospeech\v1**\google\cloud\texttospeech\v1" - is repeated twice in path)

#### Steps to reproduce

1. Run the code
2. See the error

Code:
```TypeScript
import * as protos from "google-proto-files";

const paths = {
v1: protos.getProtoPath("cloud/texttospeech/v1/cloud_tts.proto"),
v1_lrs: protos.getProtoPath("cloud/texttospeech/v1/cloud_tts_lrs.proto"),
};

protos.loadSync(
paths.v1_lrs
);
```

Error message:
```
Error: ENOENT: no such file or directory, open 'C:\PROJECTS\google_ai_text_to_speech\node_modules\google-proto-files\google\cloud\texttospeech\v1\google\cloud\texttospeech\v1\cloud_tts.proto'
```