Fix a typo in video_stats table recover partitions

Summary:
This looks like a copypaste accident, the ALTER TABLE ... RECOVER
PARTITIONS is run for daily_video_stats twice and video_stats never.
It's probably unrelated to the video_stats failures we've been seeing,
but possible has value.

Test Plan: Fingers crossed.

Reviewers: jace

Reviewed By: jace

Differential Revision: http://phabricator.khanacademy.org/D2091