use the correct front page icon
use the correct front page icon

fixes COMMS-501

Test Plan
- Create a page
- go to its show page (/pages/<page-name>)
- click on the settings icon
- notice the icon is correct

Change-Id: I424de41ca34b557d8a44dd10a40756edb80e5062
Reviewed-on: https://gerrit.instructure.com/132431
Tested-by: Jenkins
Reviewed-by: Venk Natarajan <f9eab59b292314637a3c917fea4742741e36a19b@instructure.com>
QA-Review: Aaron Kc Hsu <089edc94045de3d9f5f372fb17706d21afcc259f@instructure.com>
Product-Review: Steven Burnett <a0b450117c5d20a22d5c4d52bb8ae13adee003d8@instructure.com>

instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms