.zuul: Re-align

This will make the subsequent commit easier to read.

https://github.com/containers/toolbox/pull/984

.zuul.yaml

@@ -15,7 +15,15 @@
     name: system-test-fedora-rawhide
     description: Run Toolbox's system tests in Fedora Rawhide
     timeout: 2700
-    files: &system_test_files ['data/*', 'playbooks/*', 'profile.d/*', 'src/*', 'meson.build', 'meson_options.txt', '.zuul.yaml']
+    files: &system_test_files [
+      'data/*',
+      'playbooks/*',
+      'profile.d/*',
+      'src/*',
+      'meson.build',
+      'meson_options.txt',
+      '.zuul.yaml',
+    ]
     nodeset:
       nodes:
         - name: ci-node-rawhide