Remove cruft from wmgVisualEditorDisableForAnons no longer needed

This was set to let the anon cache epoch expire; it's been more than 30 days for
both dewiki and enwiki, so safe to remove to clean up the config and more it more
understandable.

Change-Id: Idae6f6da53f71edc410016929e08815445f76d66
Enable VisualEditor as opt-in on svwiktionary

Available as opt-in, only in the User: namespace, per community request.

Bug: 57356
Change-Id: I70e8a8cc55a7865fe102d0a89e10f122fbd13303
Merge "Remove cruft from wmgVisualEditorDisableForAnons no longer needed"
Merge "Enable VisualEditor as opt-in on svwiktionary"