Merge pull request #47526 from backwardspy/master

set StartupWMClass in linux `.desktop` file

misc/dist/linux/org.godotengine.Godot.desktop

@@ -9,3 +9,4 @@ PrefersNonDefaultGPU=true
 Type=Application
 MimeType=application/x-godot-project;
 Categories=Development;IDE;
+StartupWMClass=Godot