minor #46776 [Validator] refactoring IsTrueValidator (sfmok)

This PR was merged into the 6.2 branch.

Discussion
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[Validator] refactoring IsTrueValidator

| Q             | A
| ------------- | ---
| Branch?       | 6.2
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| License       | MIT
| Refactoring? | yes

Commits
-------

ad4f6f677e refactoring IsTrueValidator

Author: fabpot

Constraints/IsTrueValidator.php

@@ -29,15 +29,13 @@ public function validate(mixed $value, Constraint $constraint)
             throw new UnexpectedTypeException($constraint, IsTrue::class);
         }
 
-        if (null === $value) {
+        if (null === $value || true === $value || 1 === $value || '1' === $value) {
             return;
         }
 
-        if (true !== $value && 1 !== $value && '1' !== $value) {
-            $this->context->buildViolation($constraint->message)
-                ->setParameter('{{ value }}', $this->formatValue($value))
-                ->setCode(IsTrue::NOT_TRUE_ERROR)
-                ->addViolation();
-        }
+        $this->context->buildViolation($constraint->message)
+            ->setParameter('{{ value }}', $this->formatValue($value))
+            ->setCode(IsTrue::NOT_TRUE_ERROR)
+            ->addViolation();
     }
 }