Fix JAWS bug on outcomes alignment view

JAWS was reading out a miscellaneous 'button-menu'
after every line on the learning mastery gradebook's
student view page for an outcomes alignments modal.
The fix was to change aria-owns to aria-controls.

Fixes CNVS-27850

Test Plan
 - Ensure that the outcome modal in the student view of the
   learning mastery gradebook no longer reads out 'button-menu'
 - Test that other screen readers still work as expected

Change-Id: If63bdbf5bae31285a3e122641b4cb46ef8ac0764
Reviewed-on: https://gerrit.instructure.com/83350
Tested-by: Jenkins
Reviewed-by: Ryan Taylor <rtaylor@instructure.com>
QA-Review: Indira Pai <ipai@instructure.com>
Product-Review: Aaron Cannon <acannon@instructure.com>

Author: Marc Alan Phillips

app/views/jst/grade_summary/outcome.handlebars

@@ -22,7 +22,7 @@
   <div class="description">{{{description}}}</div>
 </div>
 <div class="alignment-info">
-  <a href="#tab-outcomes/{{id}}" role="button" aria-haspopup='true' aria-owns='outcome_detail'>
+  <a href="#tab-outcomes/{{id}}" role="button" aria-haspopup='true' aria-controls='outcome_detail'>
     {{#ifGreaterThan count 8 }}
       {{#t 'alignment_count_summary'}}<strong>8</strong> out of <strong>{{count}}</strong> Alignments{{/t}}
     {{else}}