bug#35605: GNOME Settings: Region & Language: Input source keyboard button does not work

[sirgazil]

Hi,

I installed the GNU system using Guix 1.0 ISO installer, and reconfigured the 
system to work around the installer "%base-packages" bug 
(https://debbugs.gnu.org/cgi/bugreport.cgi?bug=35541).

Every time I click the little keyboard button in Input sources, nothing happens.


## Steps to reproduce

1. Go to GNOME Settings → Language & Region → Input Sources.
2. Click on one of the sources.
3. Click the button that has a keyboard icon.


## Unexpected result

Nothing happens.


## Expected result

The Keyboard Layout window is displayed showing you the key mappings for the 
selected input source. Like this:

https://multimedialib.files.wordpress.com/2019/05/gnome-keyboard-layout-window-2019-05-06.png


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