Remove no longer needed call to processEvents

After cf631a0222 this call is no longer
needed to work around the problem described in #1649.

See discussion in issue #1943.

src/MainWindow.cpp

@@ -3051,7 +3051,6 @@ bool MainWindow::loadProject(QString filename, bool readOnly)
         currentProjectFilename = filename;
 
         if(ui->mainTab->currentWidget() == ui->browser) {
-            qApp->processEvents();
             if (!currentTable.isEmpty())
                 switchToBrowseDataTab(currentTable);
             populateTable();     // Refresh view