Update method for safe search detection

[aliciawilliams]

The method for safe search detection has been changed. I made a few changes to the code in order to complete this tutorial: https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/functions/imagemagick/index.js. This is my first Github contribution (ever), so let me know if/how to proceed.

1. Added new const request immediately after the const file declaration.

const request = {
    source: {
      imageUri: `gs://${object.bucket}/${file.name}`
    }
  };

2. Changed method name in line 44 from vision.detectSafeSearch(file) to vision.safeSearchDetection(request)
3. Updated the evaluation for determining an inappropriate image to account for new format of JSON response. Now looks for adult and violence outcomes of VERY_LIKELY or LIKELY.

.then((results) => {
      const detections = results[0].safeSearchAnnotation;
      if (detections.adult == 'VERY_LIKELY' || detections.adult == 'LIKELY' || detections.violence == 'VERY_LIKELY' || detections.violence == 'LIKELY') {
        console.log(`The image ${file.name} has been detected as inappropriate.`);
        return blurImage(file);
      } else {
        console.log(`The image ${file.name} has been detected as OK.`);
      }
    });
```javascript

[fhinkel]

Closed due to inactivity. Feel free to reopen if needed.