QmlDesigner: Revert bumping the puppet version

Since Qt Creator 3.1 will be released before Qt 5.3,
bumping the version number and enforcing to rebuild the puppet
creates a huge hurdle for end users.

Change-Id: Ic85a2ed315cf67b7d47bdfa492e6c5d2adf719d9
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>

share/qtcreator/qml/qmlpuppet/qml2puppet/qml2puppetmain.cpp

@@ -112,7 +112,7 @@ int main(int argc, char *argv[])
     }
 
     if (application.arguments().count() == 2 && application.arguments().at(1) == "--version") {
-        std::cout << 3;
+        std::cout << 2;
         return 0;
     }