shell: wget: Reduce verbosity
shell: wget: Reduce verbosity

This enabled using one . per MB for progress report. This should greatly
reduce the spam in the CI.

Fixes #131

fluendo/cerbero,nirbheek/cerbero,fluendo/cerbero,atsushieno/cerbero,nirbheek/cerbero,fluendo/cerbero,GStreamer/cerbero,GStreamer/cerbero,fluendo/cerbero,atsushieno/cerbero,GStreamer/cerbero,fluendo/cerbero,atsushieno/cerbero,GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero,atsushieno/cerbero,nirbheek/cerbero,atsushieno/cerbero