Default applications not linked (and not launching) on PinePhone
<!--
Thank you for using postmarketOS! In order to speed up process of resolving your issue,
we would like you to fill in the following issue template:
-->
### Describe your issue
#### What's the expected behaviour?
Applications will launch if a file is opened. E.g. music player on clicking on a .mp3 file.
#### What's the current behaviour?
Most applications aren't launching. There may be an error message, or nothing at all.
Default Applications in Settings shows no entries except for Browser and Image Files, and I can't select anything manually.
#### How to reproduce your issue?
Try to open a file in, e.g. Portfolio, or another app such as a messenger.
Open Settings->Default Applications and try to set e.g Music
### What device are you using?
<!--
Leave name of your device in vendor-codename format.
If unsure, check name in the device package or leave full name of device
-->
PINE64 PinePhone
### On what postmarketOS version did you encounter the issue?
<!--
Replace space inside `[ ]` with `x` to fill the checkbox
-->
* [ ] edge (`master` branch)
* [x] `v21.12`
### On what environment did you encounter the issue?
#### Phone environments
* [x] Phosh
* [ ] Plasma Mobile
* [ ] Sxmo (Wayland/Sway)
#### Other
* [ ] No environment
* [ ] GNOME
* [ ] KDE Plasma
* [ ] Kodi
* [ ] MATE
* [ ] Shelli
* [ ] Sway
* [ ] Weston
* [ ] Xfce4
* [ ] fbkeyboard
* [ ] i3wm
* [ ] Sxmo (Xorg/Dwm)
### How did you get postmarketOS image?
* [ ] from https://images.postmarketos.org
* [x] I built it using pmbootstrap
* [ ] It was preinstalled on my device
### What's the build date of the image? (in yyyy-mm-dd format)
<!--
Notes:
can be left empty if unsure
If you downloaded image from images.postmarketos.org, date will be in yyyymmdd format
-->
### Additional information
<!-- logs, etc. -- make use <details> for long listings -->
The applications that are working are the original ones shipped with pmOS 21.12.2 Phosh. I've changed some of the others. e.g. audacious instead of lollypop. Email is geary.
I have the same OS and version (and applications) on motorola-harpia. All the fields in Default Applications have entries and are launching correctly.
issue