AutoTest: Always parse if plugin is enabled

Remove the 'Always parse' setting and respective special handling.
This simplifies the handling of parsing for tests and removes
strange special handling that was introduced in earlier versions
and led more to confusion on the user side.

Change-Id: Ia4d122ed448244f3cb3876dda9930864afde9c28
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/testresultspane.cpp

@@ -259,11 +259,9 @@ void TestResultsPane::visibilityChanged(bool visible)
                 this, &TestResultsPane::updateRunActions);
         // make sure run/run all are in correct state
         updateRunActions();
-        TestTreeModel::instance()->enableParsing();
     } else {
         disconnect(TestTreeModel::instance(), &TestTreeModel::testTreeModelChanged,
                    this, &TestResultsPane::updateRunActions);
-        TestTreeModel::instance()->disableParsing();
     }
     m_wasVisibleBefore = visible;
 }