add for to labels and aria-invalid to theme editor
add for to labels and aria-invalid to theme editor

fixes CNVS-22283

test plan:
  - go to theme editor
  - if you click on a color's
    label, it focuses on the input
  - if you input an invalid color and
    then inspect element on its input,
    you see aria-invalid is true
    - it is false when it is not invalid

Change-Id: Ic4ff57967f96784942d83d210eb0046d67114b81
Reviewed-on: https://gerrit.instructure.com/59775
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Tested-by: Jenkins
QA-Review: Jeremy Putnam <b030d6d6f199f844ec424882be473c2ab9adc93b@instructure.com>
Product-Review: Aaron Cannon <25919c673621c006b735dcd5a28df63325948e2b@instructure.com>

efrj/canvas-lms,greyhwndz/canvas-lms,instructure/canvas-lms,dgynn/canvas-lms,whalejasmine/canvas-lms,jay3126/canvas-lms,fronteerio/canvas-lms,snehakachroo1/LSI_replica,efrj/canvas-lms,djbender/canvas-lms,HotChalk/canvas-lms,redconfetti/canvas-lms,tgroshon/canvas-lms,instructure/canvas-lms,kyroskoh/canvas-lms,instructure/canvas-lms,SwinburneOnline/canvas-lms,redconfetti/canvas-lms,leftplusrightllc/canvas-lms,AndranikMarkosyan/lms,skmezanul/canvas-lms,utkarshx/canvas-lms,whalejasmine/canvas-lms,fronteerio/canvas-lms,instructure/canvas-lms,skmezanul/canvas-lms,jay3126/canvas-lms,roxolan/canvas-lms,efrj/canvas-lms,sdeleon28/canvas-lms,matematikk-mooc/canvas-lms,greyhwndz/canvas-lms,antoniuslin/canvas-lms,sfu/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms,utkarshx/canvas-lms,utkarshx/canvas-lms,tgroshon/canvas-lms,djbender/canvas-lms,whalejasmine/canvas-lms,dgynn/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,sfu/canvas-lms,efrj/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,juoni/canvas-lms,roxolan/canvas-lms,sdeleon28/canvas-lms,snehakachroo1/LSI_replica,whalejasmine/canvas-lms,snehakachroo1/LSI_replica,antoniuslin/canvas-lms,sfu/canvas-lms,AndranikMarkosyan/lms,matematikk-mooc/canvas-lms,roxolan/canvas-lms,dgynn/canvas-lms,kyroskoh/canvas-lms,venturehive/canvas-lms,kyroskoh/canvas-lms,leftplusrightllc/canvas-lms,sdeleon28/canvas-lms,dgynn/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,narigone/canvas,sfu/canvas-lms,sfu/canvas-lms,HotChalk/canvas-lms,redconfetti/canvas-lms,leftplusrightllc/canvas-lms,instructure/canvas-lms,juoni/canvas-lms,jay3126/canvas-lms,instructure/canvas-lms,fronteerio/canvas-lms,tgroshon/canvas-lms,narigone/canvas,SwinburneOnline/canvas-lms,jay3126/canvas-lms,SwinburneOnline/canvas-lms,juoni/canvas-lms,narigone/canvas,skmezanul/canvas-lms,roxolan/canvas-lms,HotChalk/canvas-lms,greyhwndz/canvas-lms,antoniuslin/canvas-lms,greyhwndz/canvas-lms,sdeleon28/canvas-lms,djbender/canvas-lms,kyroskoh/canvas-lms,tgroshon/canvas-lms,venturehive/canvas-lms,AndranikMarkosyan/lms,juoni/canvas-lms,matematikk-mooc/canvas-lms,AndranikMarkosyan/lms,grahamb/canvas-lms,snehakachroo1/LSI_replica,instructure/canvas-lms,grahamb/canvas-lms,matematikk-mooc/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,redconfetti/canvas-lms,skmezanul/canvas-lms,leftplusrightllc/canvas-lms,antoniuslin/canvas-lms,narigone/canvas,utkarshx/canvas-lms