[gnome-system-monitor] Add StartupWMClass to desktop files

[Robert Roth <robertroth src gnome org>]

commit fecb395660e5ff7742a2d32f65eedba16ca70bda
Author: ToMe25 <ToMe25 gmx de>
Date:   Sat Oct 15 20:34:10 2022 +0200

    Add StartupWMClass to desktop files

 gnome-system-monitor-kde.desktop.in | 1 +
 gnome-system-monitor.desktop.in     | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/gnome-system-monitor-kde.desktop.in b/gnome-system-monitor-kde.desktop.in
index 40b0a309..9e47a4e5 100644
--- a/gnome-system-monitor-kde.desktop.in
+++ b/gnome-system-monitor-kde.desktop.in
@@ -8,6 +8,7 @@ Icon=org.gnome.SystemMonitor
 Terminal=false
 Type=Application
 StartupNotify=true
+StartupWMClass=gnome-system-monitor
 Categories=GNOME;GTK;System;Monitor;
 OnlyShowIn=KDE;
 # Translators: Search terms to find this application. Do NOT translate or localize the semicolons! The list 
MUST also end with a semicolon!
diff --git a/gnome-system-monitor.desktop.in b/gnome-system-monitor.desktop.in
index c9fbfe84..3ffef8a7 100644
--- a/gnome-system-monitor.desktop.in
+++ b/gnome-system-monitor.desktop.in
@@ -8,6 +8,7 @@ Icon=org.gnome.SystemMonitor
 Terminal=false
 Type=Application
 StartupNotify=true
+StartupWMClass=gnome-system-monitor
 Categories=GNOME;GTK;System;Monitor;
 NotShowIn=KDE;
 # Translators: Search terms to find this application. Do NOT translate or localize the semicolons! The list 
MUST also end with a semicolon!