DW should not depend on the current skin

Before the migration, we have 4.5.2 wiki that have a custom skin (that need to be manually upgraded by the user).

During the last step of DW, the default base skin has been changed to "Flamingo" and so you see that DW has a new look. But the problem is that the custom skin may not have upgraded the "javascript.vm", so it does not include "requirejs", and so the last DW step does not work normally.

In our case, it reports that it has javascript broken, preventing expansion of the spaces in the treeview.
The console reports:

Uncaught ReferenceError: require is not defined extension.js:1
Uncaught ReferenceError: require is not defined logging.js:1