[Bug] Multiline dashboard doesn't work in 4.0.2

[lybinhlap]

Request Type

Bug

Work Environment

Question	Answer
OS version (server)	Ubuntu
OS version (client)	Ubuntu 20.04
TheHive version / git hash	4.0.2
Package Type	DEB
Browser type & version	Edge

Problem Description

I still have encountered with issue about Multiline dashboard doesn't work in thehive 4.0.2. I saw this issue was fixed in thehive 4.0.1 with #1503

Steps to Reproduce

1. Go to Dashboard -> Edit a dashboard -> Add Multiline widget.

3. Only the last series is piloted

[nadouani]

It looks like both of them are plotted but the data is the same. Look at the selected plot, it shows high=71 and medium=71.

Please feel free to reopen if you have more input.

[lybinhlap]

In fact, the number of high alerts and medium alerts are not equal. I ran searches in Alerts tab:

So I think I am encountering the same problem like #1503