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)
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