NexoPOS 4.7.8

[Blair2004]

This is a quick fix update. The main purpose is to fix an issue faced while creating/updating a user.
Surprisingly, we weren't able to spot that during test. We've also added new tests that cover that.

Changelog:

• Fixed: Issue while creating/editing a user fix [Issue] Can't Set Role for New User #773 [Issue] Cannot assign role for user when enable Mutistore module v7.4.4 #770

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This discussion was created from the release NexoPOS 4.7.8.