pulse: fix discovery of newly added devices

Fix regression introduced in 7bc5e28d preventing the device provider to send the device-added message for new devices. The patch meant to handle changes notifications to detect default device changes but was actually discarding all the NOT change events.

Fix #735 (closed)

@thiblahute : can you please take a look as it fixes a regression from one of your patch? thanks :)

mentioned in issue #735 (closed)

added 1.16 Needs backport labels

added Regression label

added 5 commits

• 9ff8b8fc...c54aa053 - 4 commits from branch gstreamer:master
• 5b80b65b - pulse: fix discovery of newly added devices

Compare with previous version

assigned to @gstreamer-merge-bot

mentioned in commit gdesmott/gst-plugins-good@27ced4c8

added 2 commits

• 87d43746 - 1 commit from branch gstreamer:master
• 27ced4c8 - pulse: fix discovery of newly added devices

Compare with previous version

merged

changed milestone to %1.17.1

mentioned in commit tpm/gst-plugins-good@f08cd65a

added Backported into 1.16 label and removed Needs backport label

Merge Request for backport into 1.16 branch: !747 (merged) (target milestone: 1.16.3)

mentioned in merge request !747 (merged)