videoep: remove redundant nestings
videoep: remove redundant nestings

This change removes a bunch of unnecessary if-else nestings, and it allows to
define change_newwinn_to_appwin() function to be executed in the same way as
create_appwin() function.

maemo-foss/maemo-multimedia-ohm-plugins-misc,maemo-foss/maemo-multimedia-ohm-plugins-misc,jusa/ohm-plugins-misc,jusa/ohm-plugins-misc,jusa/ohm-plugins-misc,tswindell/ohm-plugins-misc,maemo-foss/maemo-multimedia-ohm-plugins-misc,tswindell/ohm-plugins-misc,tswindell/ohm-plugins-misc,jusa/ohm-plugins-misc