apparmor-pipewire: Fix test metadata

Bad test definition prevents to run the test.

Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>

test-cases/apparmor-pipewire.yaml

 metadata:
-  name: apparmor-pipewire 1.0"
+  name: apparmor-pipewire
+  format: "Apertis Test Definition 1.0"
   image-types:
     target:  [ armhf, amd64 ]
     basesdk: [ amd64 ]