Bugfix/Enable editing of labels with shortcut keys #396
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As reported in #379, it's currently not possible to edit a label that has a shortcut key set. This is because in the LabelSerializer we're checking if any other label has the same prefix or suffix key as the serialized label:
https://github.com/chakki-works/doccano/blob/55c6cc27abfdd9d8ab8cfc4ef493116519f750c4/app/api/serializers.py#L43-L46
However, if we're editing a label and not changing its prefix or suffix key, the check will always retrieve the currently edited label as a conflict. The solution to this problem implemented in this pull request is to exclude the currently edited label from the check.
Resolves #379