Fix comment hide persistor by tracking via simply pathname

Fixes honestbleeps#3897

Reddit URLs generally contain all the unique canonical bits in the pathname, and the pathname stays constant. Query parameters and subdomain shouldn't affect whether a comment is hidden.

lib/modules/commentHidePersistor.js

@@ -29,7 +29,7 @@ module.go = async () => {
 let allHiddenThings = {};
 let hiddenKeys = [];
 let hiddenThings = [];
-const hiddenThingsKey = location.href;
+const hiddenThingsKey = location.pathname;
 const maxKeys = 100;
 const pruneKeysTo = 50;