Returns mobile special page module loading to wgResourceModules

This is in essence a partial revert of Change-Id: I891f9b4fc1f4d06db0ddad828aba6a50efdf182d,
which works fine in Beta when we have full resource support, but is busted
in production without ResourceLoader support, but otherwise maintains
the dynamic generation of mobile special page resource modules.

We can go back to doing this in the invocation of the
ResourceLoaderRegisterModules hook after we have RL support
everywhere.

Change-Id: Ie1e088732a11b3fd101a96d2e1959bf7598a35d6