MOBILE-4081 forum: Fix prefetch behat test

Author: dpalou

src/addons/mod/forum/tests/behat/basic_usage.feature

@@ -329,4 +329,9 @@ Feature: Test basic usage of forum activity in app
     When I press the back button in the app
     And I press "Sort by last post creation date in descending order" in the app
     And I press "Sort by last post creation date in ascending order" in the app
-    Then I should find "There was a problem connecting to the site. Please check your connection and try again." in the app
+    Then I should find "Forum not available in this sorting order" in the app
+
+    When I press the back button in the app
+    And I press "Test forum name" in the app
+    Then I should find "Forum not available in this sorting order" in the app
+    And I should find "Sort by last post creation date in ascending order" in the app

src/addons/mod/forum/tests/behat/groups.feature

@@ -366,4 +366,4 @@ Feature: Test usage of forum activity with groups in app
 
     When I press "Visible groups" in the app
     And I press "Group 1" in the app
-    Then I should find "There was a problem connecting to the site. Please check your connection and try again." in the app
+    Then I should find "Forum not available in this sorting order" in the app