debian/control: don't require dh-systemd if it's transitional

... not to fail if it was removed.
8 jobs for feature/bullseye in 3 minutes and 1 second (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed #99382
docker
build/debian/bullseye

00:01:56

passed #99383
docker
build/debian/buster

00:02:51

passed #99385
docker
build/ubuntu/bionic

00:02:32

passed #99384
docker
build/ubuntu/focal

00:03:00

 
  Test
skipped #99386
docker
test/debian/bullseye
skipped #99387
docker
test/debian/buster
skipped #99389
docker
test/ubuntu/bionic
skipped #99388
docker
test/ubuntu/focal
 
Name Stage Failure
failed
build/debian/bullseye Build
	cd obj-x86_64-linux-gnu && go generate -v
cd obj-x86_64-linux-gnu && go install -trimpath -v -p 1
no Go files in /builds/packaging/deb-icingadb/build/icingadb/obj-x86_64-linux-gnu
dh_auto_build: error: cd obj-x86_64-linux-gnu && go install -trimpath -v -p 1 returned exit code 1
make: *** [debian/rules:19: build] Error 25
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
[ binary build failed! ]
Cleaning up file based variables
ERROR: Job failed: exit code 1