Remove processEvents in PythonEngineWorker::doRun()

[MinyazevR]

When the destructor of trikPythonRunner is called, mWorkerThread->quit() is invoked. The finished signal of mWorkerThread is connected to pythonEngineWorker::deleteLater. However, when attempting to free resources immediately after script execution (in PythonEngineWorker::doRun()), calls to QCoreApplication::processEvents reset the interrupt flag set by mWorkerThread->quit(). As a result, QEventLoop::exec calls bloking MsgWaitForMultipleObjectsEx (via QEventDispatcherWin32::processEvents) with the INFINITE flag (specifically for QEventLoop::WaitForMoreEvents), which leads to waiting for a PostMessage call that can be triggered by QEventLoop::wakeUp, QAbstractEventDispatcher::interrupt, or re-calling qthread->quit. Calls to QCoreApplication::processEvents with QEventLoop::WaitForMoreEvents generate the QAbstractEventDispatcher::aboutToBlock signal. This solution should not introduce regression because all current calls to QCoreApplication::processEvents occur with QEventLoop::AllEvents and will not be canceled.