Minor - Fix behat forum tests

public/main/template/default/forum/posts.html.twig

@@ -20,7 +20,7 @@
             <div class="row">
                 <div class="col-md-2">
                     <div class="thumbnail">
-                        <img src="{{ post.author | user_avatar }}?w=100&h=100&fit=crop">
+                        <img src="{{ post.author | illustration }}?w=100&h=100&fit=crop">
                     </div>
                     {{ post.user_data }}
                 </div>

public/main/template/default/my_space/user_details.html.twig

@@ -16,7 +16,7 @@
                 <div class="col-md-4">
                     <div class="user text-center">
                         <div class="avatar">
-                            <img width="128px" src="{{ user | user_avatar }}" class="img-responsive">
+                            <img width="128px" src="{{ user | illustration }}" class="img-responsive">
                         </div>
                         <div class="name">
 {#                            <h3>{{ user.complete_name_link }}</h3>#}

public/main/template/default/tracking/tracking_course_log.html.twig

@@ -191,7 +191,7 @@ window.onload = function() {
                                         <img
                                             title="{{ student.fullname }}"
                                             alt="{{ student.fullname }}"
-                                            src="{{ student.user | user_avatar }}"
+                                            src="{{ student.user | illustration }}"
                                             width="40px">
                                     </span>
                                 </div>

tests/behat/features/toolForum.feature

@@ -7,7 +7,7 @@ Feature: Forum tool
     And I am on course "TEMP" homepage
 
   Scenario: Create a forum category
-    Given I am on "/main/forum/index.php?action=add&content=forumcategory&cid=1"
+    Given I am on "/main/forum/index.php?action=add_category&cid=1"
     When I fill in the following:
       | forum_category_title   | Forum Category Test |
     And I fill in ckeditor field "forum_category_comment" with "This is the first forum category for test"
@@ -15,7 +15,7 @@ Feature: Forum tool
     Then I should see "The forum category has been added"
 
   Scenario: Create a forum
-    Given I am on "/main/forum/index.php?action=add&content=forum&cid=1"
+    Given I am on "/main/forum/index.php?action=add_forum&cid=1"
     When I fill in the following:
       | forum_title   | Forum Test |
     And I fill in ckeditor field "forum_comment" with "This is the first forum for test"