force use of no elide and scrollbars in main tab

depending on the style used on a given system the text in the tab bar for
selection of different charts (summary, ride plot...) may be elided on
screens with small resoulution.   This overrides the use of scrollbars
which is set  explicitly in the code. this one line patch forces the use of
non-elided text in the the tabs so that scroll bars appear.

src/MainWindow.cpp

@@ -230,6 +230,7 @@ MainWindow::MainWindow(const QDir &home) :
 
     tabWidget = new QTabWidget;
     tabWidget->setUsesScrollButtons(true);
+    tabWidget->setElideMode(Qt::ElideNone);
 
     // setup trainWindow
     trainWindow = new TrainWindow(this, home);