test(s3): drop unnecessarily added fclose

Signed-off-by: Josh <josh.t.richards@gmail.com>

Author: joshtrichards

tests/lib/Files/ObjectStore/S3Test.php

@@ -180,8 +180,5 @@ public function testFileSizes($size): void {
 		self::assertTrue(feof($result), 'End of file reached after read attempt');
 
 		$this->assertNoUpload('testfilesizes');
-
-		fclose($sourceStream);
-		fclose($result);
 	}
 }