ci(github): do not define @{att} globally during re-attached tests.

.github/workflows/main.yml

@@ -45,6 +45,7 @@ jobs:
           if [[ ${{ matrix.os }} == ubuntu-24.04 ]] && [[ ${{ matrix.mode }} == default ]]; then
             # Test with Re-attach disconnected path
             sed -e 's;// builder.Register("attach");builder.Register("attach");' -i pkg/prebuild/cli/cli.go
+            sed -e '/@{att}/d' -i apparmor.d/tunables/multiarch.d/system
           fi
           bash dists/build.sh dpkg