Fix process to manually change vouchers

[hugosolar]

Fixes #379

Description

This fix changes the applicant status to vouching when we manually change vouchers, otherwise, the newly selected voucher will not see the applicant request

Checklist

• [x] My pull request has a descriptive title (not a vague title like Update index.md).
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• [x] My commit messages follow best practices.
• [ ] I added tests for the changes I made (if applicable).
• [ ] I added or updated documentation (if applicable).
• [ ] I tried running the project locally and verified that there are no visible errors.

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