bug #10535 [Form] Fixed tests after merging pattern deprecation (stefanosala)

This PR was merged into the 2.5-dev branch.

Discussion
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[Form] Fixed tests after merging pattern deprecation

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Tests were not run on #10001.
Here are some fixes.

Commits
-------

e2d8944 Fixed tests after merging pattern deprecation

src/Symfony/Component/Form/Tests/AbstractLayoutTest.php

@@ -1497,7 +1497,7 @@ abstract class AbstractLayoutTest extends \Symfony\Component\Form\Test\FormInteg
         $this->assertWidgetMatchesXpath($form->createView(), array(),
 '/textarea
     [@name="name"]
-    [not(@pattern)]
+    [@pattern="foo"]
     [.="foo&bar"]
 '
         );