This reverts commit 47585530.

Conflicts:
	daemon/src/audio/audioloop.cpp

* #28212: manager: on configuration error, automatically restore last working configuration file backup

If a ringtone is being played, and another one selected, the new one
should begin playing immediately.

Also guarantee that playback has stopped once we've destroyd the widget.

Now the seekbar will only be updated if the updates correspond to
its associated file.

This reverts commit ce1d39f9.

We now preview ringtones via recordedFile API.

Use vector size directly instead of channels member variable.

This makes seekslider independent of calls.

The sample count was not taking into account multichannel output,
so not enough samples were being written to the output.

This will allow clients to preview ringtones

The vector itself was being written to a file, instead of the samples.