Fix conflict with subreddit scraper and RES.

Companion was getting extra data after the subreddit on some pages in
browsers running Reddit Enhancement Suite (was adding "+shortcut" to the
end of info.subreddit).

src/redditContent.js

@@ -26,7 +26,7 @@ function scrapeThingInfo(thing) {
 
   info.score = parseInt(thing.querySelector('.score'+scoreClass).innerText)
 
-  info.subreddit = (thing.querySelector('a.subreddit') || document.querySelector('.redditname:first-child')).innerText
+  info.subreddit = (thing.querySelector('a.subreddit') || document.querySelector('.redditname > a')).innerText
 
   info.num_comments = parseInt(thing.querySelector('.comments').innerText) || 0