General: Trim the input data in maybe_unserialize(), for consistency with is_serialized().

Props pbearne, mikeschroder.
Fixes #36416.

git-svn-id: https://develop.svn.wordpress.org/trunk@47454 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/functions.php

@@ -291,6 +291,7 @@ class Tests_Functions extends WP_UnitTestCase {
 				),
 				true,
 			),
+			array( '   s:25:"this string is serialized";   ', true ),
 		);
 	}