[Bug 741495] tests/aggregator: Use correct type when setting property

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741495
  GStreamer | gst-plugins-base | git

--- Comment #2 from Sebastian Rasmussen <sebras at hotmail.com> 2014-12-14 00:35:30 UTC ---
this was meant to be raised for gst-plugins-bad, not -base. can you change that
or at least apply the patch in the right place? :)

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