minor symfony#28504 [Form] Fix expected values in datetime-local test (mcfedr)

This PR was submitted for the master branch but it was merged into the 4.1 branch instead (closes symfony#28504).

Discussion
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[Form] Fix expected values in datetime-local test

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#28372
| License       | MIT
| Doc PR        | N/A

Commits
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5ed8b27 Fix expected values in datetime-local test

Author: nicolas-grekas

src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTimeTypeTest.php

@@ -258,13 +258,13 @@ public function testSubmitDifferentTimezonesDateTimeImmutable()
 
         $outputTime = new \DateTimeImmutable('2010-06-02 03:04:00 Pacific/Tahiti');
 
-        $form->submit('2010-06-02T03:04:00-10:00');
+        $form->submit('2010-06-02T03:04:00');
 
         $outputTime = $outputTime->setTimezone(new \DateTimeZone('America/New_York'));
 
         $this->assertInstanceOf(\DateTimeImmutable::class, $form->getData());
         $this->assertEquals($outputTime, $form->getData());
-        $this->assertEquals('2010-06-02T03:04:00-10:00', $form->getViewData());
+        $this->assertEquals('2010-06-02T03:04:00', $form->getViewData());
     }
 
     public function testSubmitStringSingleText()