minor #11026 [Validator] Fix a parameter name in a test (elnur)

This PR was merged into the 2.3 branch.

Discussion
----------

[Validator] Fix a parameter name in a test

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | not required

Commits
-------

069e925 Fix a parameter name in a test

src/Symfony/Component/Validator/Tests/Constraints/NotBlankValidatorTest.php

@@ -35,12 +35,12 @@ class NotBlankValidatorTest extends \PHPUnit_Framework_TestCase
     /**
      * @dataProvider getValidValues
      */
-    public function testValidValues($date)
+    public function testValidValues($value)
     {
         $this->context->expects($this->never())
             ->method('addViolation');
 
-        $this->validator->validate($date, new NotBlank());
+        $this->validator->validate($value, new NotBlank());
     }
 
     public function getValidValues()