修复了无法正常关闭程序的Bug

SpaceSniffer.py

@@ -1,4 +1,5 @@
 import os
+import sys
 import webbrowser
 import threading
 import tkinter as tk
@@ -465,8 +466,7 @@ class App(tk.Tk):
     def on_close(self):  # 关闭程序
         if self.scanner.is_alive():
             self.scanner.join()
-        root.destroy()
-        exit()
+        sys.exit(0)
 
     def set_window_size(self):  # 设置窗口大小
         screen_width = self.winfo_screenwidth()
@@ -599,13 +599,11 @@ if __name__ == "__main__":
     update_manager = UpdateManager(root, is_startup=True)
     proceed = update_manager.check_latest_release()
     if not proceed:
-        root.destroy()
-        exit()
+        sys.exit(0)
     start_path = filedialog.askdirectory()
     if start_path:
         app = App(start_path)
         app.mainloop()
     else:
         messagebox.showinfo("提示", "没有选中任何目录，程序即将退出")
-        root.destroy()
-        exit()
+        sys.exit(0)