"Open Mirrored Invoice" button for all mirrored invoices and adjust positioning

For mirrored freight invoices we have a button for "Open Mirrored Invoice" available. For efficiency we want the same feature on Demurrage Claim invoices and any future invoices that will be mirrored.

In addition: When using this feature already on the mirrored freight invoice, the actual mirrored invoice when opened is hovering just above the other invoice. For the untrained eye it will not appear that you actually opened the invoice, but if you click and drag on the black menu bar and move it, you will reveal the invoice underneath.
Please adjust/move the default 'open position' for this feature so both invoices will be displayed for the user.

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