minor symfony#61338 [Form] use false instead of null to hide the currency symbol (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
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[Form] use `false` instead of `null` to hide the currency symbol

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

This slipped in with symfony#61296. Technically, there shouldn't be a difference but since we explicitly mention false in the documentation let's better be safe here.

Commits
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ecd674d use false instead of null to hide the currency symbol

Author: nicolas-grekas

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

@@ -76,7 +76,7 @@ public function testSubmitNull($expected = null, $norm = null, $view = null)
 
     public function testMoneyPatternWithoutCurrency()
     {
-        $view = $this->factory->create(static::TESTED_TYPE, null, ['currency' => null])
+        $view = $this->factory->create(static::TESTED_TYPE, null, ['currency' => false])
             ->createView();
 
         $this->assertSame('{{ widget }}', $view->vars['money_pattern']);