Fix wrong state of Run/Run All buttons

Introduced with fa28f1cb30

Change-Id: I80f5e08bcf2b630fcf7a4a77d47db6e7b7d26e50
Reviewed-by: Robert Loehning <robert.loehning@theqtcompany.com>

plugins/autotest/testresultspane.cpp

@@ -190,6 +190,8 @@ void TestResultsPane::visibilityChanged(bool visible)
             return;
         connect(TestTreeModel::instance(), &TestTreeModel::testTreeModelChanged,
                 this, &TestResultsPane::onTestTreeModelChanged);
+        // make sure run/run all are in correct state
+        onTestTreeModelChanged();
         m_wasVisibleBefore = true;
         TestTreeModel::instance()->enableParsing();
     } else {