Guake opens in the middle of the screen with Xorg

This case is similar to #1844

**Describe the bug**

When click on the lower screen it appears in the uppers screen in the middle

**Expected behavior**

Guake appears top of the lower screen

**Actual behavior**

Guake apperas in the middle of the upper screen.

**To Reproduce**

Ubuntu 20.04 , Python 3.8 , Guake recent master

-------------------------------------------------------------------------------

$ guake --support
$ guake --support

Guake Version: 3.7.1

Vte Version: 0.60.3

Vte Runtime Version: 0.60.3

--------------------------------------------------
GTK+ Version: 3.24.20

GDK Backend: GdkX11.X11Display

--------------------------------------------------
Desktop Session: ubuntu

--------------------------------------------------
Display: :0

RGBA visual: True

Composited: True

* Monitor: 0 - BOE eDP-1
* Geometry: 1920 x 1080 at 0, 1200
* Size: 309 x 174 mm²
* Primary: True
* Refresh rate: 59.93 Hz
* Subpixel layout: unknown
* Monitor: 1 - DEL HDMI-1
* Geometry: 1920 x 1200 at 0, 0
* Size: 518 x 324 mm²
* Primary: False
* Refresh rate: 59.95 Hz
* Subpixel layout: unknown