Fix ITLayoutDocumentValidationTest tests

ITLayoutDocumentValidationTest.testDocumentValidationInvalid
ITLayoutDocumentValidationTest.testDocumentValidationValid

[2020-07-31T02:13:38.562Z] org.openqa.selenium.WebDriverException: Element is not clickable at point (466.83331298828125, 164.4499969482422). Other element would receive the click: <div class="ambiance-title"></div>
[2020-07-31T02:13:38.562Z] Command duration or timeout: 65 milliseconds
[2020-07-31T02:13:38.562Z] Build info: version: '2.53.0', revision: '35ae25b', time: '2016-03-15 17:00:58'
[2020-07-31T02:13:38.562Z] System info: host: 'nuxeo-jsf-11-88sps', ip: '10.61.99.133', os.name: 'Linux', os.arch: 'amd64', os.version: '4.14.138+', java.version: '11.0.7'
[2020-07-31T02:13:38.562Z] Driver info: org.openqa.selenium.firefox.FirefoxDriver
[2020-07-31T02:13:38.562Z] Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=42.0, platform=LINUX, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
[2020-07-31T02:13:38.562Z] Session ID: 192e256f-4670-4abf-a684-e7480b616fae
[2020-07-31T02:13:38.562Z] 	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
[2020-07-31T02:13:38.562Z] 	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:?]
[2020-07-31T02:13:38.563Z] 	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
[2020-07-31T02:13:38.563Z] 	at java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[?:?]
[2020-07-31T02:13:38.563Z] 	at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:206) ~[selenium-server-standalone-2.53.0.jar:?]
[2020-07-31T02:13:38.563Z] 	at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:158) ~[selenium-server-standalone-2.53.0.jar:?]
[2020-07-31T02:13:38.563Z] 	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:678) ~[selenium-server-standalone-2.53.0.jar:?]
[2020-07-31T02:13:38.563Z] 	at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:327) ~[selenium-server-standalone-2.53.0.jar:?]
[2020-07-31T02:13:38.563Z] 	at org.openqa.selenium.remote.RemoteWebElement.click(RemoteWebElement.java:85) ~[selenium-server-standalone-2.53.0.jar:?]
[2020-07-31T02:13:38.563Z] 	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
[2020-07-31T02:13:38.563Z] 	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
[2020-07-31T02:13:38.563Z] 	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
[2020-07-31T02:13:38.563Z] 	at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
[2020-07-31T02:13:38.563Z] 	at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:51) ~[selenium-server-standalone-2.53.0.jar:?]
[2020-07-31T02:13:38.563Z] 	at com.sun.proxy.$Proxy40.click(Unknown Source) ~[?:?]
[2020-07-31T02:13:38.563Z] 	at org.nuxeo.functionaltests.formsLayoutDemo.page.ValidationPage.submit(ValidationPage.java:68) ~[classes/:?]
[2020-07-31T02:13:38.563Z] 	at org.nuxeo.ftest.formsLayoutDemo.ITLayoutDocumentValidationTest.testDocumentValidationInvalid(ITLayoutDocumentValidationTest.java:49) ~[test-classes/:?]