QmlJSInspector: Always allow play/pause and changing animation speed

There seems to be no reason not to allow this outside of the observer
mode.

src/plugins/qmljsinspector/qmlinspectortoolbar.cpp

@@ -358,7 +358,6 @@ void QmlInspectorToolBar::activateDesignModeOnClick()
 {
     bool checked = m_observerModeAction->isChecked();
 
-    m_playAction->setEnabled(checked);
     m_selectAction->setEnabled(checked);
     m_zoomAction->setEnabled(checked);
     m_colorPickerAction->setEnabled(checked);