VE-1685: Do not mess up Venus edit section links by removing subscribtion to DoEditSectionLink MediaWiki hook

It might look like it would hurt Oasis but it wouldn't - cause Oasis was overwriting output of that hook anyways in skins/oasis/modules/ContentDisplayController.class.php. The "bonus" of this change is that now we won't be doing that not necessary processing for Oasis.

https://wikia-inc.atlassian.net/browse/VE-1685