Revert "docs(troubleshooting): Add workaround for "blur" plugin in KDE (

#3328)"

This reverts commit 8810c5c.

Appears this was fixed with the latest nvidia drivers or KDE 6.2, not
sure which, but it's probably good to clean this page up.

docs/troubleshooting.md

@@ -165,14 +165,6 @@ high as long as the encoder is used.
 ### Gamescope compatibility
 Some users have reported stuttering issues when streaming games running within Gamescope.
 
-### Occasional flickering in KDE
-
-The `blur` plugin causes flickering during streaming for some people. Disable it from the
-KDE System Settings or from the commandline:
-```bash
-qdbus org.kde.KWin /Effects unloadEffect blur
-```
-
 ## macOS
 
 ### Dynamic session lookup failed