Fixed windows-only import

modules/theme_titlebar.py

@@ -1,7 +1,6 @@
 import platform
 import sys
 import sv_ttk
-from ctypes import byref, c_int, sizeof, windll
 from distutils.version import StrictVersion as Version
 from os import system
 from tkinter import Tcl, Toplevel
@@ -9,6 +8,9 @@ from typing import Literal, Union
 
 from ttkthemes import ThemedTk
 
+if sys.platform.startswith("win"):
+    from ctypes import byref, c_int, sizeof, windll
+
 
 def theme_title_bar(window: Union[ThemedTk, Toplevel], mode: Literal["dark", "light"]) -> None:
     """