tests: audiodecoder: speed up audiodecoder_buffer_after_segment test
requested to merge tpm/gst-plugins-base:tests-speed-up-audiodecoder-buffer-after-segment-test into master
We're creating buffers with one sample per buffer here for some reason. The actual value of the segment stop is irrelevant for what we're testing here, so lower it to 10ms so that we create fewer buffers which speeds things up on slow machines and in valgrind.