Fix MobilePay silent auth failures, add QR regeneration, persist paym…

[momocoder14]

What are the changes about?

• Surface Vipps accesstoken/get failures as a clear error instead of hanging on "Afventer QR scan" or continuing with a null token (mobilepay.php, mobilepayListen.php, sys_div_func.php QR setup)
• Add a "Regenerer QR-kode" button so a stale till QR can be refreshed without manual DB edits (sys_div_func.php + regenerate_mobilepay_qr.php)
• Persist the Vipps payment reference into pos_betalinger.receipt_id for completed MobilePay payments: pass the reference through the success redirect, rename afslut()'s unused $line parameter to $receipt_id so it actually reaches settlePOS.php, and fix settlePOS.php's (int) cast which zeroed out the varchar column

Have you checked the following?

• I have updated relevant documentation at https://github.com/DANOSOFT/saldi/wiki
• I have checked that i am not linking to any external resources such as external style- or JavaScript-files, that could compromise stability
• I have read and understood the developer guidelines
  https://docs.google.com/document/d/1GOmomtvKf21OV2VWNOIPweDi4gJHpMCK5qXzrPrypUc/edit?usp=sharing

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