Remove duplicate new page btn from edit wiki

Annabel Dunstone Grayrequested to merge
19075-new-wiki into master

What does this MR do?

Removes duplicate button on wiki page

What are the relevant issue numbers?

Closes #19075 (closed)

Screenshots (if relevant)

Screen_Shot_2016-06-24_at_9.45.28_AM Screen_Shot_2016-06-24_at_9.45.57_AM

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