MDL-44871 behat: Hack to make equation editor visible

lib/editor/atto/plugins/equation/tests/behat/equation.feature

@@ -7,6 +7,9 @@ Feature: Atto equation editor
     Given I log in as "admin"
     When I navigate to "Edit profile" node in "My profile settings"
     And I set the field "Description" to "<p>Equation test</p>"
+    # Set field on the bottom of page, so equation editor dialogue is visible.
+    And I expand all fieldsets
+    And I set the field "Picture description" to "Test"
     And I select the text in the "Description" Atto editor
     And I click on "Show more buttons" "button"
     And I click on "Equation editor" "button"