Revert "Issue #452: Fix 500 error with `%` in `code`. (#453)"

This reverts commit 46dcdef043.

lib/routing.js

@@ -93,7 +93,8 @@ export const updateQueryString = state => {
     const mappedState = mapper.map(reverseMappings, state)
 
     history.replace({
-      search: encodeURIComponent(keysToQuery(mappedState))
+      // Do NOT change this to encodeURIComponent
+      search: encodeURI(keysToQuery(mappedState))
     })
   }
 }