fix: if statement to disable windows transparency

main.py

@@ -24,8 +24,7 @@ args = parser.parse_args()
 def run_gui():
     app = QtWidgets.QApplication([])
     widget = MainWindow()
-    if state.window_transparency is True:
-        if platform.system() != "Windows":
+    if state.window_transparency and platform.system() != "Windows":
         qdarktheme.setup_theme("auto", custom_colors={"background": "#00000000"})
         widget.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground)
     else: