Remove old WikiEditor settings

The NTOC, template editor and highlight modules of WikiEditor have
been removed in the change sets:
I0f53a68e50fc950d7f407ee81b2bf0d81ef4948d
I47119d6cfdde4b40ff5b07be0c7d327b80598142
I9740a1197209f177217b034e8b94a90b3905a560

Change-Id: I0865cb61eb9f926282fe6efbfd6e7bb363219094
Merge "Remove old WikiEditor settings"