approvals: move post approval endpoint to /post_approvals.

Move the post approval endpoint from `POST /moderator/post/approval` to
`POST /post_approvals`.

test/functional/moderator/post/approvals_controller_test.rb

@@ -1,25 +0,0 @@
-require 'test_helper'
-
-module Moderator
-  module Post
-    class ApprovalsControllerTest < ActionDispatch::IntegrationTest
-      context "The moderator post approvals controller" do
-        setup do
-          @admin = create(:admin_user)
-          as_admin do
-            @post = create(:post, :is_pending => true)
-          end
-        end
-
-        context "create action" do
-          should "render" do
-            post_auth moderator_post_approval_path, @admin, params: {:post_id => @post.id, :format => "js"}
-            assert_response :success
-            @post.reload
-            assert(!@post.is_pending?)
-          end
-        end
-      end
-    end
-  end
-end

test/functional/post_approvals_controller_test.rb

@@ -3,11 +3,22 @@ require 'test_helper'
 class PostApprovalsControllerTest < ActionDispatch::IntegrationTest
   context "The post approvals controller" do
     setup do
-      @approval = FactoryBot.create(:post_approval)
+      @approver = create(:approver)
+    end
+
+    context "create action" do
+      should "render" do
+        @post = create(:post, is_pending: true)
+        post_auth post_approvals_path(post_id: @post.id, format: :js), @approver
+
+        assert_response :success
+        assert(!@post.reload.is_pending?)
+      end
     end
 
     context "index action" do
       should "render" do
+        @approval = create(:post_approval)
         get post_approvals_path
         assert_response :success
       end