Improve performance of screen_get_dpi() in Javascript

Replace a bisect with a single multiplication when calling
screen_get_dpi() in Javascript

Tested the value of
window.matchMedia(`(resolution:${(window.devicePixelRatio*96).toFixed(100)}dpi)`).matches
which is true except for values that cause a lot of rounding errors
(e.g. dpr : 0.3  => resolution: 28.799999999999997dpi)

Even in these cases the value matches the result of the previous
`findDPI()` method.

See also:

https://github.com/godotengine/godot/commit/6cff589b5bd483b563fe465bde74ca94902aab41#r81273660

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