report: remove extra space from screenshot preview

[adamraine]

Before:

After:

[paulirish]

@adamraine Just ran into a regression which I think is related to this change...

The preview thumbnail is 5300px talll

Repro is theverge. mobile. offscreen-images audit. But... I was scrolling during gathering, sooooo...

without much thinking i attempted.....

    if (elementPreviewSizeSC.width < elementPreviewSizeSC.height) {
      elementPreviewSizeSC.width = Math.min(screenshot.width, elementPreviewSizeSC.width);
    } else {
      elementPreviewSizeSC.height = Math.min(screenshot.height, elementPreviewSizeSC.height);
    }

and the results looked good. but I'm not sure about the impact on the example.com testcase that motivated this.
Can you take a look?

[adamraine]

I was scrolling during gathering, sooooo...

I haven't gotten this audit to fail unless I'm scrolling. Have you?