Do not call moveToThread(this) in QWindowsFileSystemWatcherEngineThread

This is considered bad practice, and gives no benefit as the threads do
not use an eventloop.

Change-Id: I0de9eca97948571cf5091e2f1b19bb1faab3e2ac
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

src/corelib/io/qfilesystemwatcher_win.cpp

@@ -297,7 +297,6 @@ QWindowsFileSystemWatcherEngineThread::QWindowsFileSystemWatcherEngineThread()
         handles.reserve(MAXIMUM_WAIT_OBJECTS);
         handles.append(h);
     }
-    moveToThread(this);
 }