Fix Ia6bf604c: Update another caller to ve.init.mw.Target

MobileViewTarget.

Due to this being missed, pageName was getting set to a jQuery object,
which eventually got passed as a data value in a $.ajax call, causing
jQuery to emit a TypeError: Illegal invocation.

I guess this needs a MobileFrontend commit as well. Don't think it fixes
all the issues with loading VE mobile though.

Bug: T78710
Change-Id: I431a902563f608a7a33028cd60112f39c57000a4