test: remove redundant test/assertion in HarTest

Remove assertNotSame assertion in testCloneBrowserIsDeep as the deep
clone behavior is already verified by the subsequent modification test.

Author: claude

tests/src/Unit/HarTest.php

@@ -74,9 +74,6 @@ public function testCloneBrowserIsDeep(): void
         // Clone the HAR
         $cloned = clone $har;
 
-        // Verify the Browser object is a different instance
-        $this->assertNotSame($har->getLog()->getBrowser(), $cloned->getLog()->getBrowser());
-
         // Modify the cloned HAR's browser version
         $cloned->getLog()->getBrowser()->setVersion('modified-version');