maemo5: fix settings dialog

It was impossible to modify custom actions on maemo

Signed-off-by: Corentin Chary <corentin.chary@gmail.com>

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   CMakeLists.txt
#	modified:   pkg/maemo5/debian/changelog
#	modified:   pkg/maemo5/serieswatcher.desktop
#	modified:   src/settingsdialog.cpp
#	modified:   src/settingsdialog.h
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	build-qttvdb/
#	build-stamp
#	configure-stamp
#	debian
#	pkg/maemo5/debian/files
#	pkg/maemo5/debian/serieswatcher.debhelper.log
#	pkg/maemo5/debian/serieswatcher.postinst.debhelper
#	pkg/maemo5/debian/serieswatcher.postrm.debhelper
#	pkg/maemo5/debian/serieswatcher.substvars
#	pkg/maemo5/debian/serieswatcher/
#	pkg/maemo5/debian/tmp/
#	qttvdb/
