[Bug]: PoI Plugin UI not validating

[F-Node-Karlsruhe]

Issue description

When uploading a poi.json the validation fails

Expected behaviour

It should validate just as on the API.

The client builder should call /api instead of /dashboard/api here https://github.com/iotaledger/node-dashboard/blob/develop/src/services/pluginService.ts#L230

Actual behaviour

It calls a wrong route and thereby receives a 404 instead of a proper validation repsonse

Can the issue reliably be reproduced?

Yes

Steps to reproduce the issue

1. Upload poi.json containing a valid POI

Errors

404 -> The given proof of inclusion for the block is invalid.

Duplicate declaration

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