data: Fix typo in desktop files

Closes #205
8 jobs for master in 14 minutes and 13 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #316021
librem5
build:native

00:02:55

 
  Test
passed #316023
librem5
build-gtkdoc

00:02:48

passed #316024
librem5
check-po

00:00:25

passed #316022
librem5
test:native

00:02:37

 
  Package
passed #316025
librem5
package:deb-debian-buster

00:02:42

passed #316026
librem5:arm64
package:deb-debian-buster:arm64

00:07:12

 
  Test Package
passed #316027
librem5
autopkgtest-debian-buster-package

00:01:17

passed #316028
librem5
lintian-debian-buster-package

00:00:31