Invoice cache kept after copying invoice with file_id

When copying an invoice on a system with file_id set, the id is not cleared so Tryton keep sending the original report cache.

assigned to @ced

added accounting type::behavior + 1 deleted label

added 1 deleted label and removed 1 deleted label

review321801002 updated at https://codereview.tryton.org/321801002/#ps310051002

New changeset 7383144676cd by Cédric Krier in branch 'default':
Clear invoice_report_cache_id on copy
https://hg.tryton.org/modules/account_invoice/rev/7383144676cd

added 1 deleted label and removed 1 deleted label

closed

New changeset aabff76fc79d by Cédric Krier in branch 'default':
Clear invoice_report_cache_id on copy
https://hg.tryton.org/tryton-env/rev/aabff76fc79d

New changeset c0375e41686c by Cédric Krier in branch '5.6':
Clear invoice_report_cache_id on copy
https://hg.tryton.org/modules/account_invoice/rev/c0375e41686c

New changeset ee059c4efd31 by Cédric Krier in branch '5.4':
Clear invoice_report_cache_id on copy
https://hg.tryton.org/modules/account_invoice/rev/ee059c4efd31

New changeset 15b14b7115a3 by Cédric Krier in branch '5.0':
Clear invoice_report_cache_id on copy
https://hg.tryton.org/modules/account_invoice/rev/15b14b7115a3