minor symfony#16592 [Form] Fix ResolvedFormType deprecation notices (nicolas-grekas)

This PR was merged into the 2.8 branch.

Discussion
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[Form] Fix ResolvedFormType deprecation notices

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

Commits
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baafb7a [Form] Fix ResolvedFormType deprecation notices

Author: Tobion

src/Symfony/Component/Form/ResolvedFormType.php

@@ -71,12 +71,12 @@ public function __construct(FormTypeInterface $innerType, array $typeExtensions
             // Anyone else should only override getBlockPrefix() if they actually
             // want to have a different block prefix than the default one
             if ($isOldOverwritten && !$isNewOverwritten) {
-                @trigger_error(get_class($this->innerType).': The FormTypeInterface::getName() method is deprecated since version 2.8 and will be removed in 3.0. Remove it from your classes. Use getBlockPrefix() if you want to customize the template block prefix. This method will be added to the FormTypeInterface with Symfony 3.0.', E_USER_DEPRECATED);
+                @trigger_error(get_class($innerType).': The FormTypeInterface::getName() method is deprecated since version 2.8 and will be removed in 3.0. Remove it from your classes. Use getBlockPrefix() if you want to customize the template block prefix. This method will be added to the FormTypeInterface with Symfony 3.0.', E_USER_DEPRECATED);
             }
 
             $blockPrefix = $innerType->getBlockPrefix();
         } else {
-            @trigger_error(get_class($this->innerType).': The FormTypeInterface::getBlockPrefix() method will be added in version 3.0. You should extend AbstractType or add it to your implementation.', E_USER_DEPRECATED);
+            @trigger_error(get_class($innerType).': The FormTypeInterface::getBlockPrefix() method will be added in version 3.0. You should extend AbstractType or add it to your implementation.', E_USER_DEPRECATED);
 
             // Deal with classes that don't extend AbstractType
             // Calculate block prefix from the FQCN by default