Borders are occasionally 1px off on floating views

[WillPower3309]

Issue produced on swayfx running in nested mode on a 1440p 27" monitor with 1x scale. Not every position displays the bug, so usually the window has to be moved pixel by pixel... Setting a larger border size makes it easier to detect so moving pixel by pixel isn't usually needed.

Shown in the below images with a border size of 3px.

In the picture above, the effect can be seen when zoomed into the window on the bottom right segment of the screen.

[WillPower3309]

Issue could be due to a lack of floor() being called on x / y position of the views

[WillPower3309]

Will be fixed as part of #127, removing from 0.3 milestone as #127 is aimed for 1.0