Incorrect max capacity update in SiteStatsDaoRedis._update_basic()

[TomerGodinger]

The current code (lines 52-54) sets the new maximum capacity to reading.wh_generated:

max_capacity = self.redis.hget(key, SiteStats.MAX_CAPACITY)
if not max_capacity or reading.current_capacity > float(max_capacity):
    self.redis.hset(key, SiteStats.MAX_CAPACITY, reading.wh_generated)

Instead, line 54 should set it to reading.current_capacity:

    self.redis.hset(key, SiteStats.MAX_CAPACITY, reading.current_capacity)