fix uglified component mounting
fix uglified component mounting

fixes: CNVS-34655

test plan:
 - set the following env vars:
   - RAILS_LOAD_ALL_LOCALES=true
   - USE_OPTIMIZED_JS=true
 - compile assets with: `rake canvas:compile_assets`
 - go to gradezilla enabled gradebook
 - the page loads without the following JS console error:
   - "Uncaught Error: _registerComponent(...): Target container is not a
   DOM element."

Change-Id: Ib9722608da0e156129162662d639718c7cb041e1
Reviewed-on: https://gerrit.instructure.com/100834
Reviewed-by: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>
Reviewed-by: Shahbaz Javeed <6692d7be3fa215e5483a121d6fb314def6049877@instructure.com>
Tested-by: Jenkins
QA-Review: Anju Reddy <851202533fb1f0b615e4547ba226c76996d060dd@instructure.com>
Product-Review: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>

sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,matematikk-mooc/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,matematikk-mooc/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,sfu/canvas-lms