Make apps_startstop fonts always rollback, as it's crashing GNOME

This breaks subsequent modules, we need to roll back for them to
work.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

tests/apps_startstop/gnome/fonts.pm

@@ -24,7 +24,7 @@ sub run {
 }
 
 sub test_flags {
-    return {};
+    return {always_rollback => 1};
 }
 
 1;