debian/control: fix the debian control file

Fix lintian warnings

Signed-off-by: Angus Ainslie <angus@akkea.ca>
5 jobs for pureos/byzantium in 1 minute and 44 seconds (queued for 1 second)
Status Job ID Name Coverage
  Package
passed #366672
librem5
package-pureos-byzantium

00:00:38

passed #366673
librem5:arm64
package-pureos-byzantium:arm64

00:01:44

 
  Test Package
passed #366674
librem5
autopkgtest-pureos-byzantium-package

00:00:48

passed #366676
librem5
check-tarball

00:00:49

passed #366675
librem5
lintian-pureos-byzantium-package

00:00:43