Improve search box placement

[federico-terzi]

Reported by @JeppeKlitgaard in https://github.com/federico-terzi/espanso/issues/779

Placement of search box

The placement of the window may be improved if it opens up nearer to the position of the current input. Windows Emoji Keyboard, for example, opens just below the current input cursor. This is particularly important when using multiple displays. For me, the search window always opens on the primary display, which is out of sight when working on the second display.

[vwfs-sasmoe]

This is related to #983 I guess.