[FIX] hr_expense: Make _check_employee dependent on employee_id
[FIX] hr_expense: Make _check_employee dependent on employee_id

Purpose
=======

Employee must match on sheet and lines

Since the employee_id field of hr.expense.sheet is modifiable in submit state, there is a possibility to modify a sheet in such a way that the employee does not match on the expense sheet and expense lines. This commit fixes this.

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