Revert "Speed up startup time a bit"

This reverts commit 77d1eda07478a566a45b022af61d51c84ac68279.

Let's not use "private" modules for nonexistent performance boosts.

src/decorators.py

@@ -1,5 +1,5 @@
 import fnmatch
-from _collections import defaultdict
+from collections import defaultdict
 
 import botconfig
 from oyoyo.parse import parse_nick

src/settings.py

@@ -1,4 +1,4 @@
-from _collections import defaultdict
+from collections import defaultdict
 import math
 from src import events
 

src/wolfgame.py

@@ -25,7 +25,7 @@ import botconfig
 import traceback
 from src import decorators
 from datetime import datetime, timedelta
-from _collections import defaultdict
+from collections import defaultdict
 import threading
 import copy
 import time