Use more battery friendly timeout_add_seconds

The following helper scripts should be changed to be more battery friendly:

scripts/mpd_control.py:

gobject.timeout_add(1000, self.update_title)
→ gobject.timeout_add_seconds(1, self.update_title)

scripts/transmission_badge.py:

self.timer = gobject.timeout_add(UPDATE_DELAY, self.refresh_item)
→ self.timer = gobject.timeout_add_seconds(UPDATE_DELAY / 1000, self.refresh_item)

scripts/liferea_badge.py:

self.timer = gobject.timeout_add (10000, self.update_badge)
→ self.timer = gobject.timeout_add_seconds (10, self.update_badge)

scripts/gajim_badge.py:

self.timer = gobject.timeout_add (5000, self.update_badge)
→ self.timer = gobject.timeout_add_seconds (5, self.update_badge)

scripts/banshee_control.py:

self.timer = gobject.timeout_add (1000, self.update_badge)
→ self.timer = gobject.timeout_add_seconds (1, self.update_badge)

scripts/deluge_badge.py:

self.timer = gobject.timeout_add (2000, self.update_badge)
→ self.timer = gobject.timeout_add_seconds (2, self.update_badge)

scripts/workrave_helper.py:

self.timers.append(gobject.timeout_add(5000, self.__poll_workrave))
→ self.timers.append(gobject.timeout_add_seconds(5, self.__poll_workrave))
self.timers.append(gobject.timeout_add(1000, self.__update_ui))
→ self.timers.append(gobject.timeout_add_seconds(1, self.__update_ui))