Fix screenshot mode failing frequently

- Add small delay before trying to read Desktop window id
- Also fix error caused by no stderr

src/kde_material_you_colors/utils/kwin_utils.py

@@ -156,6 +156,7 @@ def get_desktop_window_id(
         script = dbus.Interface(kwin, "org.kde.kwin.Script")
         timestamp = time.strftime("%Y-%m-%d %H:%M:%S")
         script.run()
+        time.sleep(0.1)
         try:
             command = [
                 "journalctl",

src/kde_material_you_colors/utils/wallpaper_utils.py

@@ -103,7 +103,7 @@ def screenshot(self, skip_screenshot):
             )
         except subprocess.CalledProcessError as e:
             logging.exception(e)
-            self._error = "cmd: " + " ".join(e.cmd) + "\nError: " + e.stderr
+            self._error = f"cmd {e.cmd}\nError: {e.stderr}"
             return
         except Exception as e:
             logging.exception(e)