Formula for calculating physical screen size not working on MacOS with system scaling

```
width.value = screen.width * dppx;
height.value = screen.height * dppx;
```

The point is - `dppx` value do not changes when MacOS scaling changes. But `screen.width` is changing. 
Default scaling in macOS macbook pro 13:
```
screen.width = 1440
dppx = 2
```
Larger scaling in macOS macbook pro 13:
```
screen.width = 1280
dppx = 2
```
