Correct the logic for when Re-Submit appears.

Per [72358792](https://www.pivotaltracker.com/story/show/72358792).  "Re-Submit" option was rendering for auditors who otherwise lacked access due to how `if_can_edit_request` helper includes them despite lacking resubmit permissions.  The actual boolean to determine whether a user can re-submit (yes for admins, no for auditors, yes for all other editors) is already used several times above in the mustache template, and so it can be re-used here.