Generic cosmetic rules are not applied to some iframes

It looks like the generic cosmetic rules are not applied if the `iframe` `height`/`width` is less than a certain value.

Steps to reproduce:
1. Add this rule:
```adblock
##h1
```
2. Go to - https://example.org/
3. Run in browser console:
```js
(() => {
const frame = document.createElement('iframe');
frame.src = 'https://example.com/';
frame.width = '500px';
frame.height = '200px';
document.body.appendChild(frame);
})();
```
`h1` element with text `Example Domain` should be hidden by this rule - `##h1`, but it doesn't work.
It seems that it works correctly if the value of `height` is greater than `200`, like `201`, or `width` is greater than `500`, like `501`.

Screenshots



AdGuard for Windows version 7.12 nightly 10 (build 4171, CL 1.10.189)