fix: correct function call for dark mode detection

main.py

@@ -1,5 +1,6 @@
 from core.ui.gui import MainWindow
 from core.ui.gui import state_debug
+
 from PySide6 import QtWidgets
 import qdarktheme
 import darkdetect
@@ -10,7 +11,7 @@ debug = True
 def run_gui():
     state_debug(debug)
     app = QtWidgets.QApplication([])
-    if darkdetect.isDark:
+    if darkdetect.isDark():
         app.setStyleSheet(qdarktheme.load_stylesheet("dark"))
     else:
         app.setStyleSheet(qdarktheme.load_stylesheet("light"))