When sorting issues for search, the nearest and farthest due dates seem to be flipped

### Description

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### Gitea Version

1.21.4

### Can you reproduce the bug on the Gitea demo site?

Yes

### Log Gist

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### Screenshots

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### Git Version

_No response_

### Operating System

_No response_

### How are you running Gitea?

try.gitea.io

### Database

None