Fix label widget not working in issue edit

Description

The label widget doesn't work for multiple lables because the result of the input value thats returned by the selector is the following:

```
label1,label2
```
And it gets submitted like that:
```
labels=label1,label2
```
When it needs to be submitted like this:
```
labels=label1
labels=label2
```

Environment

None

Assignee

Mohammed Davoodi

Reporter

Mohammed Davoodi

Labels

None

Bitbucket URL

None

Sprint

None

Priority

Medium
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