fix(Employee Advance): selection of currency (backport #1721)

[mergify]

Currency in an employee advance is set as the currency of the selected employee's latest salary structure assignment. But if the employee does not have any assignments, it uses the currency of the default company, whereas it should be using the currency of the selected company.

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This is an automatic backport of pull request #1721 done by Mergify.

[mergify]

Cherry-pick of d63ce08 has failed:

On branch mergify/bp/version-14-hotfix/pr-1721
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	both modified:   hrms/hr/doctype/employee_advance/employee_advance.js

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[frappe-pr-bot]

🎉 This PR is included in version 14.27.0 🎉

The release is available on GitHub release

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