Spelling error in file app-init.ts

[lhubert]

This file https://github.com/Hurence/logisland.historian/blob/master/historian/frontend/src/app/app-init.ts

autehnti(cated) should be authenticated.

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DEFINITION OF DONE

• Code builds without warnings (technical task)
• Code unit tested (technical task)
• Code is reviewed by a peer colleague
• Documentation updated (user story)
• Build pushed to demo server (user story)