Manual order of subpages is sometimes not deleted with realm

[owi92]

This only happens sometimes when done manually (i.e. not automated by an end-to-end test), so it's both hard to reproduce consistently and to pinpoint the cause of this. You can try to reproduce this by following the steps below:

1. create a realm (subrealm of any other realm)
2. create some subrealms
3. manually change the order of the subrealms (page settings)
4. delete parent realm (the one created in step 1)
5. repeat steps 1 and 2 with the exact same names and paths
6. click the "Manually order" option (page settings)

Outcome: the order specified in step 3 will automatically take the one specified in the previous "incarnation" of the realm. This makes end-to-end testing this functionality tricky since the test has to rely on a specific initial order of the realms.