Wikigrok: Make query string override reset the opt out

If you're using the query string override, we can assume you want to
see the interface. Requested for user testing.

Change-Id: I0a437f81d7bb1d512556d638d6a74b57d40d91b2
Make sure WikiGrok more info overlay doesn't interfere with search

Use new .wg-moreinfo class selector instead of .overlay-content

Bug: 71158
Change-Id: I8b30f7594faeb6a58e6428ec1f0e81864a6b15e1