Bug 1562642 - Add some pocket code in the thirdparty code list r=Gijs

Depends on D52593

Differential Revision: https://phabricator.services.mozilla.com/D52594

--HG--
extra : moz-landing-system : lando

tools/rewriting/ThirdPartyPaths.txt

@@ -1,4 +1,5 @@
 browser/components/newtab/vendor/
+browser/components/pocket/content/panels/js/vendor/
 browser/components/translation/cld2/
 browser/extensions/screenshots/build/raven.js
 build/pymake