[Bug 778279] validate: fix leaks

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778279

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 345101
  --> https://bugzilla.gnome.org/attachment.cgi?id=345101&action=edit
validate: pad-monitor: fix caps leaks

These caps were not released when disposing the pad monitor.

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