"Thunar Preferences" entry now shows up intrusively in application launcher
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## Version information
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thunar 4.20.0 (Xfce 4.20), on NixOS 25.05.20241229.88195a9 (Warbler)
## Steps to reproduce
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1. Open an application launcher
2. Search for "thunar"
3. You see "Thunar Preferences" ahead of "Thunar File Manager":
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## Current behavior
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"Thunar Preferences" is present in the application launcher (and even is displayed ahead of Thunar itself), making it needlessly annoying to launch Thunar.
## Expected outcome
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The Thunar preferences window should not have its own desktop entry, IMHO. The only other app on my system that does this is KDE Connect, and that makes some kind of sense in that there _is_ no "main" UI for KDE Connect.
If I want to edit Thunar's settings, I can easily do that via Edit > Preferences... from within Thunar; I really don't need to be able to launch the preferences window on its own.
Users on NixOS can work around this by copying `/run/booted-system/sw/share/applications/thunar-settings.desktop` to `~/.local/share/applications/`, then adding `NoDisplay=true` to the latter.
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