MDL-71610 core_behat: access site admin manage tags link

admin/tool/oauth2/tests/behat/basic_settings.feature

@@ -6,6 +6,7 @@ Feature: Basic OAuth2 functionality
 
   Background:
     Given I log in as "admin"
+    And I change window size to "large"
     And I navigate to "Server > OAuth 2 services" in site administration
 
   Scenario: Create, edit and delete standard service for Google

mod/book/tests/behat/edit_tags.feature

@@ -42,6 +42,7 @@ Feature: Edited book chapters handle tags correctly
   @javascript
   Scenario: Book chapter edition of standard tags works as expected
     Given I log in as "admin"
+    And I change window size to "large"
     And I navigate to "Appearance > Manage tags" in site administration
     And I follow "Default collection"
     And I follow "Add standard tags"

mod/forum/tests/behat/edit_tags.feature

@@ -40,6 +40,7 @@ Feature: Edited forum posts handle tags correctly
   @javascript
   Scenario: Forum post edition of standard tags works as expected
     Given I log in as "admin"
+    And I change window size to "large"
     And I navigate to "Appearance > Manage tags" in site administration
     And I follow "Default collection"
     And I follow "Add standard tags"

mod/glossary/tests/behat/edit_tags.feature

@@ -41,6 +41,7 @@ Feature: Edited glossary entries handle tags correctly
 
   Scenario: Glossary entry edition of standard tags works as expected
     Given I log in as "admin"
+    And I change window size to "large"
     And I navigate to "Appearance > Manage tags" in site administration
     And I follow "Default collection"
     And I follow "Add standard tags"

mod/wiki/tests/behat/edit_tags.feature

@@ -42,6 +42,7 @@ Feature: Edited wiki pages handle tags correctly
   @javascript
   Scenario: Wiki page edition of standard tags works as expected
     Given I log in as "admin"
+    And I change window size to "large"
     And I navigate to "Appearance > Manage tags" in site administration
     And I follow "Default collection"
     And I follow "Add standard tags"