fix(Report) - Export csv/pdf with date as exposed filter

[re8260]

Description

Motivation and Context

Bug fix, empty export CSV/PDF of report with exposed date filter

How To Test This

1. Create new report
2. Add date condition
3. check checkbox to let user change filter from report
   
4. got to report, and export it as CSV or PDF

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Final checklist

• My code follows the code style of this project found here.
• My change requires a change to the documentation.
• I have read the How to Contribute guidelines.

[PedroErnst]

This fix works for the csv export.
However it doesn't work for the pdf (you would need to replicate the same changes for the function bound to 'download_pdf_button_old') just above these changes. You might want to extract all of it into a function to avoid code duplication.

Two tiny nitpicks:

• Indentation should be with 2 spaces instead of tabs as described in the code style
• Mentioning the issue in a comment is generally not considered best practice. I'd say in this case it's all pretty self explanatory.

Thanks for submitting this commit!

[Mac-Rae]

Please rebase this pull request onto hotfix-7.10.x as the hotfix branch is now specifically for 7.11.x issues.

Please take a look at our contribution guidelines for more information.

[SuiteBot]

All committers have signed the CLA.