pass non-urlified wiki page names when redirecting

test plan:
* use the wiki sidebar to create a "Link to a New Page"
* use unicode characters in the title
* click on the link
* create a new page
* confirm that the title of the new page is the same as
 the original title you entered

fixes #CNVS-12136

Change-Id: Id2dc1bb72aefa814d840f4b7fd75bcef260eda61
Reviewed-on: https://gerrit.instructure.com/33606
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: Jeremy Stanley <jeremy@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>