Merge pull request #6820 from ValdikSS/bug6404-fork-child-exit-fix

Use os._exit() for FORKed child browser opener process. Fixes #6404.

electrum/gui/qt/util.py

@@ -1001,7 +1001,7 @@ def webopen(url: str):
         if os.fork() == 0:
             del os.environ['LD_LIBRARY_PATH']
             webbrowser.open(url)
-            sys.exit(0)
+            os._exit(0)
     else:
         webbrowser.open(url)