fix(xo-web/VM/Advanced): fix 'not enought permission' error for super admins when attaching PCIs

[MathieuRA]

Description

Can be tested on the pool 172.16.210.83 with the VM MRA PCI. On the host XCP XO 8.3.0 slave 2, the PCI VGA compatible controller is ready to be attached to a VM. Feel free to migrate the VM's VDI if you need to fully test the fix

Fixes Forum#9260

Checklist

• Commit
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• PR
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