bug#40851: core-updates: GNOME Web: Application icon is rendered incorrectly

[sirgazil]

It seems this bug was reported and fixed upstream 
(https://gitlab.gnome.org/GNOME/epiphany/-/issues/979). I'm filing this bug 
anyway, for the record.

The problem is reproducible in "guix system vm" too.


## Steps to reproduce

1. guix pull --branch=core-updates
2. sudo guix system reconfigure --fallback gnome.scm
3. Reboot
4. Log in to the GNOME desktop
5. Click on Activities
6. Click on the Applications button (the one with 9 dots)
7. Look for GNOME Web icon


## Unexpected result

The icon looks wrong:

https://multimedialib.files.wordpress.com/2020/04/guix-gnome-web-icon-bug-2020-04-24.png


## Expected result

The icon should look like this one:

https://multimedialib.files.wordpress.com/2020/04/gnome-web-icon-2020-04-25.png



## System information

GNOME Web 3.34.2

$ LANG=C guix describe
Generation 77   Apr 24 2020 19:03:47    (current)
  guix 6ac6c1d
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: core-updates
    commit: 6ac6c1d28d8a89d0f9b0f15e7df2a011f24aa091
  sirgazil-x ef6ac93
    repository URL: https://gitlab.com/sirgazil/guix-channel-x.git
    branch: master
    commit: ef6ac9331a7847fdec6f0eb199524b1b755ba0d


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