fix: change updated_at to played_at

[ittipatken]

Related issue: https://github.com/docchula/FlickMan/issues/16

[ittipatken]

The bug comes from lastPlayedVideoKey localCompare. It does not compare anything because the .updated_at or in this case played_at data is not in the history. So, the lastPlayedVideoKey becomes the video that has least amount of id value.

FlickPlayer/src/app/home/course/course.page.ts

Lines 252 to 256 in 5152831

	this.lastPlayedVideoKey = Object.values(history).map(h => h.video_id).sort((a, b) => {
	// force history[b].updated_at to be a string
	// @ts-ignore
	return ('' + history[b].updated_at).localeCompare(history[a].updated_at);
	}).slice(0, 1)[0] ?? null;

For example, this is the results from console.log(history),

{
  "224": {
    "video_id": 224,
    "end_time": 1697,
    "speed": "1.000"
  },
  "225": {
    "video_id": 225,
    "end_time": 4536,
    "speed": "1.478"
  },
}

, this will return the video 224 as the lastPlayedVideoKey.