MoobotFactoids: Fix test to actually detect that sqlite3 is installed.

It works in the test suite because other plugins do the right import,
but we need to do it here as well if we want supybot-test to run on
this plugin alone.

plugins/MoobotFactoids/test.py

@@ -35,10 +35,12 @@ from supybot.test import *
 import supybot.ircutils as ircutils
 from supybot.utils.minisix import u
 
+# import sqlite3, so it's in sys.modules and conf.supybot.databases includes
+# sqlite3.
 try:
-    import sqlite
+    import sqlite3
 except ImportError:
-    sqlite = None
+    sqlite3 = None
 
 from . import plugin
 MFconf = conf.supybot.plugins.MoobotFactoids