test(boards2): add missing filetests for reply edit

[jeronimoalbi]

Add missing filetests for EditReply() function.

Related to #3623

This covers all tests for the function:

• Successfully edit of a reply
• Successfully edit of a sub-reply
• Fail because board is not found
• Fail because thread is not found
• Fail because parent reply is not found
• Fail when edited by a user that is not the creator of the reply
• Fail when reply is hidden because is flagged
• Fail w/ empty body

[Gno2D2]

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[jeronimoalbi]

This PR depends on #3653

[jeronimoalbi]

@x1unix this PR is ready for review 🙏

[x1unix]

Thank you very much for the PR