fix: timesheet based salary slip (backport #2686)

[mergify]

For salary slips based on timesheets:

• display Payment Day details in Salary Slip
• set payroll frequency in payroll entry

  ---

  This is an automatic backport of pull request fix: timesheet based salary slip #2686 done by Mergify.

[mergify]

Cherry-pick of 8abf1c4 has failed:

On branch mergify/bp/version-15-hotfix/pr-2686
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit 8abf1c4e.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   hrms/payroll/doctype/salary_slip/salary_slip.js
	modified:   hrms/payroll/doctype/salary_slip/salary_slip.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   hrms/payroll/doctype/payroll_entry/payroll_entry.json

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[frappe-pr-bot]

🎉 This PR is included in version 15.38.2 🎉

The release is available on GitHub release

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