rails3: fixes for take quiz presenter spec

fixed:
- spec was being to clever and was sharing state between tests, Since the let
statement is lazy loaded, there is no need for adding this reload! stuff on
the object at runtime to reset state.

Change-Id: Ie056600653ea1dcb578b3bd15e1e8bb67dc1f61d
Reviewed-on: https://gerrit.instructure.com/30800
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>
QA-Review: Derek DeVries <ddevries@instructure.com>