[timed] Fix Qt5 build: emit visual_reminders_status DBUS signal

Sending signal com.nokia.voland.signal.visual_reminders_status
DBUS signal was erroneously ifdeffed out from the Qt5 build.
Move setting up the signal to a more logical place that is
included in all builds.
Merge pull request #21 from pgerdt/send-visual_reminders_status-in-Qt5

[timed] Fix Qt5 build: emit visual_reminders_status DBUS signal