test: update tests for removed requiretty and audispd-plugins

- new-hooks_test.bats: Changed "Sudo hardening requires TTY" to
  "Sudo hardening configures lecture" since requiretty was removed
  (it broke GUI-launched sudo via pkexec)
- config_test.bats: Changed audispd-plugins to auditd since
  audispd-plugins was removed (deprecated in Debian 13)

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

tests/unit/new-hooks_test.bats

@@ -119,8 +119,8 @@ teardown() {
     head -5 /workspace/config/hooks/live/sudo-hardening.sh | grep -q "set -euo pipefail"
 }
 
-@test "Sudo hardening requires TTY" {
-    grep -q "requiretty" /workspace/config/hooks/live/sudo-hardening.sh
+@test "Sudo hardening configures lecture" {
+    grep -q "lecture" /workspace/config/hooks/live/sudo-hardening.sh
 }
 
 @test "Sudo hardening configures logging" {