minor symfony#17913 [2.8] [Form] minor fix some regression in tests with placeholder in AbstractLayout (HeahDude)

This PR was merged into the 2.8 branch.

Discussion
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[2.8] [Form] minor fix some regression in tests with placeholder in AbstractLayout

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

Commits
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6977583 [2.8] [Form] minor fix some tests with placeholder in AbstractLayout

Author: fabpot

src/Symfony/Component/Form/Tests/AbstractBootstrap3LayoutTest.php

@@ -847,7 +847,8 @@ public function testSingleChoiceExpandedWithPlaceholderWithoutTranslation()
             'choices_as_values' => true,
             'multiple' => false,
             'expanded' => true,
-            'translation_domain' => false,
+            'required' => false,
+            'choice_translation_domain' => false,
             'placeholder' => 'Placeholder&Not&Translated',
         ));
 

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

@@ -1016,6 +1016,7 @@ public function testSingleChoiceExpandedWithoutTranslation()
             'multiple' => false,
             'expanded' => true,
             'choice_translation_domain' => false,
+            'placeholder' => 'Placeholder&Not&Translated',
         ));
 
         $this->assertWidgetMatchesXpath($form->createView(), array(),
@@ -1092,7 +1093,8 @@ public function testSingleChoiceExpandedWithPlaceholderWithoutTranslation()
             'choices_as_values' => true,
             'multiple' => false,
             'expanded' => true,
-            'translation_domain' => false,
+            'required' => false,
+            'choice_translation_domain' => false,
             'placeholder' => 'Placeholder&Not&Translated',
         ));