bug#41058: core-updates: GNOME Maps doesn't start

[sirgazil]

This happens in both master and core-updates, although I don't know if the 
former fails for the same reason. It also happens in both real machine and 
virtual machine.


## Steps to reproduce

Assuming you are using the Guix System with GNOME:

1. Go to Activities → Show Applications (nine dots button) → All
2. Click on Maps


## Expected result

GNOME Maps starts.


## Unexpected result

GNOME Maps does not starts. You see the GNOME Maps application menu loading 
next to the "Activities" button in the GNOME desktop for a few seconds, but the 
application never starts. 


## Additional information

In both, real and virtual machines, GNOME Maps starts when run from a terminal. 
It prints the following message though:

```
$ gnome-maps

(org.gnome.Maps:22887): Gjs-WARNING **: 13:35:50.971: JS ERROR: 
Gio.IOErrorEnum: Ya existe un objeto exportado para la interfaz 
org.gnome.Sysprof3.Profiler en /org/gtk/Profiler
vfunc_dbus_unregister@resource:///org/gnome/Maps/js/application.js:269:9
main@resource:///org/gnome/Maps/js/main.js:57:12
run@resource:///org/gnome/gjs/modules/package.js:222:12
start@resource:///org/gnome/gjs/modules/package.js:206:5
@/gnu/store/agrz0vryg6ipcz4qh3q1addwdiizbkrw-gnome-maps-3.34.2/share/gnome-maps/org.gnome.Maps:2:1
```

In both, real and virtual machines, GNOME Maps also starts when run from the 
minishell (Alt+F2 and type gnome-maps).


## System information

```
GNOME Maps 3.34.1

$ LANG=C guix describe
Generation 78   May 02 2020 18:00:20    (current)
  guix 7b07852
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: core-updates
    commit: 7b07852ddb334c92bcef69666f21c599f1f0fa79
  sirgazil-x ef6ac93
    repository URL: https://gitlab.com/sirgazil/guix-channel-x.git
    branch: master
    commit: ef6ac9331a7847fdec6f0eb199524b1b755ba0df
```


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