fix(vendor_excluded): Removed exclude-pattern for vendor/vendor_prefixed directory

WPDeskPlugin/ruleset.xml

@@ -9,7 +9,6 @@
 
     <!-- Always exclude all files in dependency related directories. -->
     <exclude-pattern>*/node_modules/*</exclude-pattern>
-    <exclude-pattern>*/vendor(_prefixed)?/*</exclude-pattern>
 
 	<!-- Always exclude all tests. Differences between PHPUnit, mocking libraries and WPCS make it hard to enforce some CS. -->
 	<exclude-pattern>*/tests/*</exclude-pattern>