Merge remote-tracking branch 'upstream/free_memory_algm_dlg_close' into release-v3.7

MantidQt/API/src/AlgorithmDialog.cpp

@@ -650,7 +650,7 @@ QLayout *AlgorithmDialog::createDefaultButtonLayout(
   m_okButton->setDefault(true);
 
   m_exitButton = new QPushButton(cancelText);
-  connect(m_exitButton, SIGNAL(clicked()), this, SLOT(close()));
+  connect(m_exitButton, SIGNAL(clicked()), this, SLOT(reject()));
 
   QHBoxLayout *buttonRowLayout = new QHBoxLayout;
   buttonRowLayout->addWidget(createHelpButton(helpText));