[Misc] Fix test failures on Chrome in LiveDataIT

* Click on the left of the heading to avoid clicking on the date picker
  popup.

(cherry picked from commit aaaa0bff)

xwiki-platform-core/xwiki-platform-livedata/xwiki-platform-livedata-test/xwiki-platform-livedata-test-pageobjects/src/main/java/org/xwiki/livedata/test/po/TableLayoutElement.java

@@ -933,7 +933,13 @@ private void internalEdit(String columnLabel, int rowNumber, String fieldName, S
 
         if (save) {
             // Clicks somewhere outside the edited cell. We use the h1 tag because it is present on all pages.
-            new Actions(getDriver().getWrappedDriver()).click(getDriver().findElement(By.tagName("h1"))).perform();
+            // Click close to the left border of the h1 to avoid clicking on a potential date picker that is
+            // hopefully not that close to the left.
+            WebElement h1 = getDriver().findElement(By.tagName("h1"));
+            int width = h1.getRect().getWidth();
+            // Calculate the offset from the center to be close to the left border of the h1.
+            int xOffset = -(width / 2 - 2);
+            new Actions(getDriver().getWrappedDriver()).moveToElement(h1, xOffset, 0).click().perform();
         } else {
             // Press escape to cancel the edition.
             new Actions(getDriver().getWrappedDriver()).sendKeys(Keys.ESCAPE).build().perform();