[ISSUE] Okular is unable to save annotations added to a file

[nothingnesses <nothingnesses@users.noreply.github.com>]

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New issue by nothingnesses on void-packages repository

https://github.com/void-linux/void-packages/issues/30560

Description:
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### System

* xuname:  
  Void 5.11.16_1 x86_64-musl AuthenticAMD notuptodate rrnFF
* package:  
  okular-21.04.0_1

### Expected behavior

Annotations added in Okular is saved.

### Actual behavior

Annotations added in Okular is not saved with error:

```
Couldn't start kuiserver from org.kde.kuiserver.service: QDBusError("org.freedesktop.DBus.Error.ServiceUnknown", "The name org.kde.kuiserver was not provided by any .service files")
kf.dbusaddons: Can not find 'kdeinit5' executable at  "/home/a/.cargo/bin:/home/a/.npm-global/bin:/home/a/.idris2/bin:/home/a/.local/bin:/bedrock/cross/pin/bin:/bedrock/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/usr/local/games:/usr/games:/bedrock/cross/bin" "/usr/bin, /usr/lib/qt5/bin"
kf.kio.slaves.file: copy() QUrl("file:///tmp/okular.sSbPmD") to QUrl("file:///home/a/library/Robert Harper/Practical Foundations for Programming Languages Second Edition (9)/Practical Foundations for Programming Lang - Robert Harper.okular") mode= -1
kf.kio.slaves.file: the file doesn't have any xattr
Lost annotation on document save, something went wrong
```

### Steps to reproduce the behavior

1. Open a PDF.
2. Highlight some text using the highlighter annotation tool (<kbd>F6</kbd>, then click on the highlighter tool at top left, then drag over some text).
3. Save as a file of type "Okular document archive (\*.okular)" (<kbd>Ctrl</kbd>+<kbd>Shift</kbd>+<kbd>S</kbd>, then select "Okular document archive (*.okular)" in the "Files of type" drop-down selections, then <kbd>↵ Return</kbd>).

### Other info

Installing `kinit` prevents some of the error messages, but the following messages remain:

```
Couldn't start kuiserver from org.kde.kuiserver.service: QDBusError("org.freedesktop.DBus.Error.ServiceUnknown", "The name org.kde.kuiserver was not provided by any .service files")
Lost annotation on document save, something went wrong
```