wordbot: Fix latest wordbot patch (whoopsie)

Last patch was creating a set of the list of all matches, instead of a
set of all matches. This fixes that, and also makes the regex a raw
string.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

plugins/wordbot.py

@@ -235,7 +235,7 @@ class Wordbot(Plugin):
                 if not self.db.is_game_active(channel):
                     # Don't try to score words for inactive games
                     return
-                words_in_line = {re.findall("[a-z0-9-]+", line.lower())}
+                words_in_line = set(re.findall(r"[a-z0-9-]+", line.lower()))
                 matches = words_in_line & self.db.unmatched_words(channel)
                 for word in matches:
                     self.send_to(