Fix draft comments in graphql
Fix draft comments in graphql

Refs COMMS-1949

Test Plan:
  * Create a draft comment on a submission
  * Create a non draft comment on a submission
  * Use the graphql api to query for submission comments, and notice
    only the non draft comments are returned

Change-Id: I8396d55ceba73032612924aad1a56d80ef10553d
Reviewed-on: https://gerrit.instructure.com/186978
Reviewed-by: Ryan Norton <65299b45178f94900ff304765e8fbf07bd13b331@instructure.com>
Tested-by: Gentry Beckmann <f487939f789774cca922ca5b886632de73477ea0@instructure.com>
QA-Review: Gentry Beckmann <f487939f789774cca922ca5b886632de73477ea0@instructure.com>
Product-Review: Landon Gilbert-Bland <60d9ff23682c863d36b48b4c32c5ce5f434d29c0@instructure.com>

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