Fix test for SystemdService.is_masked

Author: CarstenGrohmann

test/test_modules.py

@@ -127,13 +127,14 @@ def test_ssh_service(host, docker_image):
     assert ssh.is_enabled
 
 
+@all_images
 def test_service_systemd_mask(host, docker_image):
     name = "sshd" if docker_image == "rockylinux9" else "ssh"
     ssh = host.service(name)
     assert not ssh.is_masked
-    host.run("systemctl mask ssh")
+    host.run(f"systemctl mask -- {name}")
     assert ssh.is_masked
-    host.run("systemctl unmask ssh")
+    host.run(f"systemctl unmask -- {name}")
     assert not ssh.is_masked