Remove signal cxn causing double unsaved prompts

Author: ferdnyc

src/windows/main_window.py

@@ -2943,7 +2943,6 @@ def __init__(self, *args, mode=None):
         # Connect signals
         if self.mode != "unittest":
             self.RecoverBackup.connect(self.recover_backup)
-        app.aboutToQuit.connect(self.close)
 
         # Initialize and start the thumbnail HTTP server
         self.http_server_thread = httpThumbnailServerThread()