magento2/magento2-page-builder#636: Responsive breakpoint switcher

- fix functional test

Author: omiroshnichenko

app/code/Magento/PageBuilder/Test/Mftf/Test/ViewportSwitcherMobile/ViewportSwitcherMobileTabsThroughBlockContentTypeTest.xml

@@ -483,6 +483,7 @@
             <argument name="viewportButton" value="mobile"/>
             <argument name="viewportStage" value="mobile"/>
         </actionGroup>
+        <click selector="{{PageBuilderPanel.searchPanel}}" stepKey="unFocusViewportSwitcher"/>
         <actionGroup ref="openPageBuilderEditPanelSmallByIndex" stepKey="openEditPanelTab1Again">
             <argument name="section" value="TabOnStage"/>
             <argument name="targetIndex" value="1"/>