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tests:nle: Unref the bus before unrefing the pipeline

Thibault Saunier requested to merge thiblahute/gst-editing-services:unittest_refcount_fix into master

Aiming at fixing a rare race condition where we get:

../subprojects/gstreamer/libs/gst/check/gstcheck.c:1258:F:nlecomposition:test_seek_on_nested:0: nested_src0_0x1a1a310 is not destroyed, 1 refcounts left!

The idea is that there might have a remaining GstMessage with the nested_src as message.src on the bus that has yet to be processed in some conditions leading to a reference still existing when unrefing the pipeline.

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