Minor fixes

monitor_thread: 
-Made code a bit easier to read by deleting one level

get_commentors: 
-took advantage of `submission.comments` only retrieving top level comments (unless you go into the `replys` part of the comment info)
-made the `redditor_list` a lot easier to understand

filter_words:
-super minor: check the O(1) before the O(n) function