gui: Fix a bug which dfu cmd can cause connrst err

- Kirdy may close and reset itself before host computer ends its session

pykirdy/driver/kirdy_async.py

@@ -646,7 +646,11 @@ class Kirdy:
 
         # Reader needn't be closed
         self._writer.close()
-        await self._writer.wait_closed()
+        try:
+            await self._writer.wait_closed()
+        except ConnectionResetError:
+            # In Hard Reset/DFU cmd, Kirdy may close its socket first
+            pass
         self._reader = None
         self._writer = None