Issue #3508772 by dydave: Automated tests: Improved tests for...

https://www.drupal.org/project/admin_toolbar/issues/3508772

Automated tests: Improved tests for AdminToolbarToolsSettingsFormTest to ensure submitted configuration values are properly saved and reflected in the display:

• The Tools menu link in the toolbar with its CSS file, tests: admin_toolbar_tools_toolbar().
• The All menus link when the max_bundle_number value (2) is lower than the number of un-deletable default core menus (5).
• The Local Tasks tab and links when enabled, tests: \Drupal\admin_toolbar_tools\AdminToolbarToolsHelper::buildLocalTasksToolbar().