Fix item description tests on IE for RadioButtonGroup and CheckBoxGroup (#9866)

uitest/src/test/java/com/vaadin/tests/components/checkboxgroup/CheckBoxGroupTest.java

@@ -292,4 +292,9 @@ public class CheckBoxGroupTest extends MultiBrowserTest {
         }
     }
 
+    // needed to make tooltips work in IE tests
+    @Override
+    protected boolean requireWindowFocusForIE() {
+        return true;
+    }
 }

uitest/src/test/java/com/vaadin/tests/components/radiobuttongroup/RadioButtonGroupTest.java

@@ -246,4 +246,10 @@ public class RadioButtonGroupTest extends MultiBrowserTest {
         }
         assertEquals("Number of items", count, i);
     }
+
+    // needed to make tooltips work in IE tests
+    @Override
+    protected boolean requireWindowFocusForIE() {
+        return true;
+    }
 }