WelcomePage: open labs and developer.qt.nokia.com in browser

These webpages are likely to require account data and therefore
we better open them in the system browser.

Change-Id: Iccc158f3e96052fcf30001ec827c23a4a8362fff
Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>

share/qtcreator/welcomescreen/gettingstarted.qml

@@ -142,13 +142,13 @@ Rectangle {
             IconAndLink {
                 iconName: "communityIcon"
                 linkText: qsTr("Online Community")
-                onClicked: gettingStarted.openHelp("http://developer.qt.nokia.com/forums")
+                onClicked: gettingStarted.openUrl("http://developer.qt.nokia.com/forums")
             }
 
             IconAndLink {
                 iconName: "labsIcon"
                 linkText: qsTr("Labs")
-                onClicked: gettingStarted.openHelp("http://labs.qt.nokia.com")
+                onClicked: gettingStarted.openUrl("http://labs.qt.nokia.com")
             }
         }