Scheduled reports ignore XLSM template format and export as XLSX

Description

When using an XLSM template and selecting XLSX as the output format, the generated report should retain the XLSM extension, following the behavior seen across all other export methods.
However, when the same template is used in a Scheduled Report, the output file is always generated as XLSX, rather than XLSM.

Pre-conditions

• Upload an XLSM template to Xporter.

Steps to Reproduce

1. Create a scheduled report using the XLSM template.

1. Configure it to send the report via email or attach it to an issue.

1. Enable the scheduled report and wait for execution.

Actual Result

• The generated report is exported as XLSX.

Expected Result

• The output file should be generated as XLSM, matching the format of the uploaded template.