Repair behavior of citation dialog after all the recent changes in src/frontends...

Repair behavior of citation dialog after all the recent changes in src/frontends/. Previously, there had been a virtual initialiseParams() method in QCitation which overrode the corresponding method in ControlCitation. But now there is no "local" controller, and so intialiseParams() overrode nothing and so never got called.

I've also made some minor changes here to GuiSelectionManager, changing updateView(), which is now used as a commonly overridden method of GuiDialog, back to update(). The method does not serve the same purpose here.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@20281 a592a061-630c-0410-9148-cb99ea01b6c8