[Bug 762793] rgvolume: modifies upstream tags in place without making them writable first

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762793

--- Comment #7 from Sjors Gielen <gnome-bugzilla at sjor.sg> ---
Awesome! I did not know that a GstTagList was supposed to be read-only as soon
as it is propagated. In that case, this is a more appropriate fix. My issue is
indeed fixed with this. Thank you!

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