ProcessInterface: Drop ProcessMode from c'tor

Drop it also from registerHandle() methods, as it wasn't
used there.

Change-Id: I34b72c38368b82f22d73314fe3cd429ed43cadbc
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/libs/utils/launchersocket.cpp

@@ -763,7 +763,7 @@ void LauncherSocket::sendData(const QByteArray &data)
         QMetaObject::invokeMethod(this, &LauncherSocket::handleRequests);
 }
 
-CallerHandle *LauncherSocket::registerHandle(QObject *parent, quintptr token, ProcessMode mode)
+CallerHandle *LauncherSocket::registerHandle(QObject *parent, quintptr token)
 {
     QTC_ASSERT(!isCalledFromLaunchersThread(), return nullptr);
     QMutexLocker locker(&m_mutex);