Fix `DetectXterm` for `fly` (Astra Linux) DE, also for `plasma` (KDE), patch available
## Summary
1. Wrong check for `plasma` desktop
2. Avoid using `fly-term` (default mapping for `x-terminal-emulator` in Astra Linux, `fly` DE), that has a number of bugs.
## Patch
[detect_xterm.diff](/uploads/a1e9fe76692b676e7873cbf023e08333/detect_xterm.diff)
issue