remove hidden attribute from duplicate ff
remove hidden attribute from duplicate ff

fixes COMMS-1171

Test Plan:
- Go to an accounts feature page
- find the duplicate modules feature option
- notice it doesn't have a hidden tag

Change-Id: Ib24de4d27a52755f9fc444af9598cbb9ec856ecf
Reviewed-on: https://gerrit.instructure.com/153258
Reviewed-by: Gentry Beckmann <f487939f789774cca922ca5b886632de73477ea0@instructure.com>
Tested-by: Jenkins
Product-Review: Steven Burnett <a0b450117c5d20a22d5c4d52bb8ae13adee003d8@instructure.com>
QA-Review: Steven Burnett <a0b450117c5d20a22d5c4d52bb8ae13adee003d8@instructure.com>

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