SSH: Delete file system watcher right after use

It's only ever needed at startup, no need to keep it around after that.

Change-Id: Icc1ada71177d4f81b0b84cd3607a8a8b7af9cec2
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/libs/ssh/sshconnection.cpp

@@ -169,7 +169,8 @@ SshConnection::SshConnection(const SshConnectionParameters &serverInfo, QObject
             if (!QFileInfo::exists(d->socketFilePath()))
                 return;
             d->socketWatcher->disconnect();
-            d->socketWatcher->removeDirectory(QFileInfo(d->socketFilePath()).path());
+            d->socketWatcher->deleteLater();
+            d->socketWatcher = nullptr;
             d->socketWatcherTimer.disconnect();
             d->socketWatcherTimer.stop();
             emitConnected();