remove visible traces of anonymous peer reviews

refs #3341

there is some backend support for anonymous peer reviews but it was never
finished and exposed in the UI, except for when posting a peer review via ajax.
this removes the visible traces of the feature until it can be completed.

test plan:
- leave a peer review comment on an assignment
- when the comment is inserted into the page, the author should be your name,
  rather than 'Anonymous'

Change-Id: I8ecaf4ab8941b4c0f3f80605445d7361ed2b2747
Reviewed-on: https://gerrit.instructure.com/12171
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>

app/models/assignment.rb

@@ -235,7 +235,6 @@ class Assignment < ActiveRecord::Base
     self.all_day_date = (zoned_due_at.to_date rescue nil) if !self.all_day_date || self.due_at_changed? || self.all_day_date_changed?
     self.submission_types ||= "none"
     self.peer_reviews_assign_at = [self.due_at, self.peer_reviews_assign_at].compact.max
-    self.anonymous_peer_reviews = true if self.peer_reviews
     @workflow_state_was = self.workflow_state_was
     @points_possible_was = self.points_possible_was
     @muted_was = self.muted_was
@@ -923,7 +922,6 @@ class Assignment < ActiveRecord::Base
     group, students = group_students(original_student)
     opts[:unique_key] = Time.now.to_s
     opts[:author] ||= opts[:commenter] || opts[:user_id].present? && User.find_by_id(opts[:user_id])
-    opts[:anonymous] = opts[:author] != original_student && self.anonymous_peer_reviews && !self.grants_right?(opts[:author], nil, :grade)
 
     if opts[:comment] && opts[:assessment_request]
       # if there is no rubric the peer review is complete with just a comment

public/javascripts/submissions.js

@@ -46,9 +46,6 @@ define([
         if($("#submission_comment_" + comment.id).length > 0) { continue; }
         var $comment = $("#comment_blank").clone(true).removeAttr('id');
         comment.posted_at = $.parseFromISO(comment.created_at).datetime_formatted;
-        if(comment.anonymous) {
-          comment.author_name = I18n.t("anonymous", "Anonymous");
-        }
         $comment.fillTemplateData({
           data: comment,
           id: 'submission_comment_' + comment.id