ENGCOM-1206: [Improvement] Implement design theme grid on ui component #14470 (fix grid class and test)

Author: IvanPletnyov

app/code/Magento/Theme/view/adminhtml/ui_component/design_theme_listing.xml

@@ -72,6 +72,9 @@
             <settings>
                 <filter>text</filter>
                 <label translate="true">Theme Path</label>
+                <fieldClass>
+                    <class name="theme_path">true</class>
+                </fieldClass>
             </settings>
         </column>
         <actionsColumn name="actions" class="Magento\Theme\Ui\Component\Listing\Column\ViewAction" sortOrder="50">

dev/tests/acceptance/tests/functional/Magento/FunctionalTest/Theme/Test/ThemeTest.xml

@@ -26,6 +26,7 @@
         <amOnPage url="{{ThemesPageIndex.url}}" stepKey="navigateToThemesIndexPage" />
         <waitForPageLoad stepKey="wait1"/>
         <dontSee selector="{{AdminThemeSection.gridCell('Magento Rush')}}" stepKey="dontSeeRushThemeInTitleColumn"/>
+        <waitForPageLoad stepKey="waitForThemeGridLoad"/>
         <seeNumberOfElements selector="{{AdminThemeSection.rowsInColumn('theme_path')}}" userInput="2" stepKey="see2RowsOnTheGrid"/>
     </test>
 </tests>