chore: fix build by removing non-existing parent method.

Correction for 8caf7ef commit.

Author: php-coder

src/test/java/ru/mystamps/web/tests/cases/WhenAnonymousUserAuthenticates.java

@@ -92,11 +92,4 @@ public void validCredentialsShouldAuthenticateUserOnSite() {
 		page.logout();
 	}
 
-	@Override
-	protected void emptyValueShouldBeForbiddenForRequiredFields() {
-		// Ignore this check entirely because login page has another behavior:
-		// message about invalid credentials displayed for all type of errors.
-		// See also test emptyValuesShouldBeConsideredAsInvalidCredentials()
-	}
-	
 }