Fix keyboard handling on results pane

Change-Id: Ib9a8d600af122bf0d6ed2cc7a63badc90fb88d43
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

plugins/autotest/testresultspane.cpp

@@ -58,6 +58,7 @@ void ResultsTreeView::keyPressEvent(QKeyEvent *event)
         emit copyShortcutTriggered();
         event->accept();
     }
+    TreeView::keyPressEvent(event);
 }
 
 TestResultsPane::TestResultsPane(QObject *parent) :