Failing tests on hidpi screen

[Marek Lewandowski]

Two test cases are failing on hidpi windows screen. Here is the dump of tests:

Error details for tests/plugins/magicline/magicline
get size
Values should be equal.
Expected: 9 (number)
Actual:   8 (number)

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Error details for tests/plugins/maximize/maximize
test maximize fire resize event with proper properties
Width should be restored.
Expected: 200 (number)
Actual:   202 (number)

System specs: win10, window.devicePixelRatio is equals to 2.5 with a 3840x2160 res.

This is not a regression, it has been that way with earlier versions.